NP-MRD: Showing NP-Card for Violaceotide B (NP0332298)

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Record Information

Version

2.0

Created at

2024-01-03 04:01:10 UTC

Updated at

2024-09-03 04:18:45 UTC

NP-MRD ID

NP0332298

Natural Product DOI

https://doi.org/10.57994/1500

Secondary Accession Numbers

None

Natural Product Identification

Common Name

Violaceotide B

Description

Violaceotide B was first documented in 2024 (PMID: 38276888). Based on a literature review very few articles have been published on Violaceotide B.

Structure

MOL SDF PDB SMILES InChI


  Mrv2104 01032404012D          

 35 37  0  0  1  0            999 V2000
   -0.1060    2.8216    0.0000 O   0  0  0  0  0  0  0  0  0  0  0  0
    0.6542    2.5011    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    0.7568    1.6825    0.0000 N   0  0  0  0  0  0  0  0  0  0  0  0
    0.4363    0.9223    0.0000 C   0  0  1  0  0  0  0  0  0  0  0  0
   -0.3858    0.9922    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
   -0.5733    1.7956    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    0.1328    2.2222    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    0.9344    0.2646    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    1.7530    0.3672    0.0000 N   0  0  0  0  0  0  0  0  0  0  0  0
    2.5132    0.0467    0.0000 C   0  0  1  0  0  0  0  0  0  0  0  0
    2.6157   -0.7719    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    3.3759   -1.0924    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    4.0336   -0.5943    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    4.7938   -0.9148    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    4.8964   -1.7334    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    5.6566   -2.0539    0.0000 O   0  0  0  0  0  0  0  0  0  0  0  0
    5.7591   -2.8725    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    4.2387   -2.2315    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    3.4785   -1.9110    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    3.1708    0.5448    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    3.0683    1.3634    0.0000 N   0  0  0  0  0  0  0  0  0  0  0  0
    3.3888    2.1236    0.0000 C   0  0  1  0  0  0  0  0  0  0  0  0
    4.2074    2.2262    0.0000 C   0  0  2  0  0  0  0  0  0  0  0  0
    4.5279    2.9864    0.0000 O   0  0  0  0  0  0  0  0  0  0  0  0
    4.7055    1.5685    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    3.9311    0.2243    0.0000 O   0  0  0  0  0  0  0  0  0  0  0  0
    0.6139   -0.4956    0.0000 O   0  0  0  0  0  0  0  0  0  0  0  0
    1.3119    2.9992    0.0000 C   0  0  2  0  0  0  0  0  0  0  0  0
    1.2093    3.8178    0.0000 C   0  0  1  0  0  0  0  0  0  0  0  0
    0.4491    4.1383    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    1.8670    4.3159    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    1.7644    5.1345    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    2.0721    2.6787    0.0000 N   0  0  0  0  0  0  0  0  0  0  0  0
    2.8907    2.7813    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    3.2112    3.5415    0.0000 O   0  0  0  0  0  0  0  0  0  0  0  0
  1  2  2  0  0  0  0
  2  3  1  0  0  0  0
  4  3  1  6  0  0  0
  4  5  1  0  0  0  0
  5  6  1  0  0  0  0
  6  7  1  0  0  0  0
  3  7  1  0  0  0  0
  4  8  1  0  0  0  0
  8  9  1  0  0  0  0
 10  9  1  0  0  0  0
 10 11  1  6  0  0  0
 11 12  1  0  0  0  0
 12 13  2  0  0  0  0
 13 14  1  0  0  0  0
 14 15  2  0  0  0  0
 15 16  1  0  0  0  0
 16 17  1  0  0  0  0
 15 18  1  0  0  0  0
 18 19  2  0  0  0  0
 12 19  1  0  0  0  0
 10 20  1  0  0  0  0
 20 21  1  0  0  0  0
 22 21  1  0  0  0  0
 22 23  1  6  0  0  0
 23 24  1  6  0  0  0
 23 25  1  0  0  0  0
 20 26  2  0  0  0  0
  8 27  2  0  0  0  0
 28  2  1  0  0  0  0
 28 29  1  6  0  0  0
 29 30  1  1  0  0  0
 29 31  1  0  0  0  0
 31 32  1  0  0  0  0
 28 33  1  0  0  0  0
 33 34  1  0  0  0  0
 22 34  1  0  0  0  0
 34 35  2  0  0  0  0
M  END


  Mrv2104 01032404012D          

 35 37  0  0  1  0            999 V2000
   -0.1060    2.8216    0.0000 O   0  0  0  0  0  0  0  0  0  0  0  0
    0.6542    2.5011    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    0.7568    1.6825    0.0000 N   0  0  0  0  0  0  0  0  0  0  0  0
    0.4363    0.9223    0.0000 C   0  0  1  0  0  0  0  0  0  0  0  0
   -0.3858    0.9922    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
   -0.5733    1.7956    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    0.1328    2.2222    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    0.9344    0.2646    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    1.7530    0.3672    0.0000 N   0  0  0  0  0  0  0  0  0  0  0  0
    2.5132    0.0467    0.0000 C   0  0  1  0  0  0  0  0  0  0  0  0
    2.6157   -0.7719    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    3.3759   -1.0924    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    4.0336   -0.5943    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    4.7938   -0.9148    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    4.8964   -1.7334    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    5.6566   -2.0539    0.0000 O   0  0  0  0  0  0  0  0  0  0  0  0
    5.7591   -2.8725    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    4.2387   -2.2315    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    3.4785   -1.9110    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    3.1708    0.5448    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    3.0683    1.3634    0.0000 N   0  0  0  0  0  0  0  0  0  0  0  0
    3.3888    2.1236    0.0000 C   0  0  1  0  0  0  0  0  0  0  0  0
    4.2074    2.2262    0.0000 C   0  0  2  0  0  0  0  0  0  0  0  0
    4.5279    2.9864    0.0000 O   0  0  0  0  0  0  0  0  0  0  0  0
    4.7055    1.5685    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    3.9311    0.2243    0.0000 O   0  0  0  0  0  0  0  0  0  0  0  0
    0.6139   -0.4956    0.0000 O   0  0  0  0  0  0  0  0  0  0  0  0
    1.3119    2.9992    0.0000 C   0  0  2  0  0  0  0  0  0  0  0  0
    1.2093    3.8178    0.0000 C   0  0  1  0  0  0  0  0  0  0  0  0
    0.4491    4.1383    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    1.8670    4.3159    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    1.7644    5.1345    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    2.0721    2.6787    0.0000 N   0  0  0  0  0  0  0  0  0  0  0  0
    2.8907    2.7813    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    3.2112    3.5415    0.0000 O   0  0  0  0  0  0  0  0  0  0  0  0
  1  2  2  0  0  0  0
  2  3  1  0  0  0  0
  4  3  1  6  0  0  0
  4  5  1  0  0  0  0
  5  6  1  0  0  0  0
  6  7  1  0  0  0  0
  3  7  1  0  0  0  0
  4  8  1  0  0  0  0
  8  9  1  0  0  0  0
 10  9  1  0  0  0  0
 10 11  1  6  0  0  0
 11 12  1  0  0  0  0
 12 13  2  0  0  0  0
 13 14  1  0  0  0  0
 14 15  2  0  0  0  0
 15 16  1  0  0  0  0
 16 17  1  0  0  0  0
 15 18  1  0  0  0  0
 18 19  2  0  0  0  0
 12 19  1  0  0  0  0
 10 20  1  0  0  0  0
 20 21  1  0  0  0  0
 22 21  1  0  0  0  0
 22 23  1  6  0  0  0
 23 24  1  6  0  0  0
 23 25  1  0  0  0  0
 20 26  2  0  0  0  0
  8 27  2  0  0  0  0
 28  2  1  0  0  0  0
 28 29  1  6  0  0  0
 29 30  1  1  0  0  0
 29 31  1  0  0  0  0
 31 32  1  0  0  0  0
 28 33  1  0  0  0  0
 33 34  1  0  0  0  0
 22 34  1  0  0  0  0
 34 35  2  0  0  0  0
M  END
> <DATABASE_ID>
NP0332298

> <DATABASE_NAME>
NP-MRD

> <SMILES>
CC[C@H](C)[C@@H]1NC(=O)[C@@H](NC(=O)[C@H](CC2=CC=C(OC)C=C2)NC(=O)[C@@H]2CCCN2C1=O)[C@@H](C)O

> <INCHI_IDENTIFIER>
InChI=1S/C25H36N4O6/c1-5-14(2)20-25(34)29-12-6-7-19(29)23(32)26-18(13-16-8-10-17(35-4)11-9-16)22(31)28-21(15(3)30)24(33)27-20/h8-11,14-15,18-21,30H,5-7,12-13H2,1-4H3,(H,26,32)(H,27,33)(H,28,31)/t14-,15+,18-,19-,20-,21-/m0/s1

> <INCHI_KEY>
YMLCBZYAEKPXDK-MYMZKXAHSA-N

> <FORMULA>
C25H36N4O6

> <MOLECULAR_WEIGHT>
488.585

> <EXACT_MASS>
488.263484895

> <JCHEM_ACCEPTOR_COUNT>
6

> <JCHEM_ATOM_COUNT>
71

> <JCHEM_AVERAGE_POLARIZABILITY>
50.86408240038853

> <JCHEM_BIOAVAILABILITY>
1

> <JCHEM_DONOR_COUNT>
4

> <JCHEM_FORMAL_CHARGE>
0

> <JCHEM_GHOSE_FILTER>
0

> <JCHEM_IUPAC>
(3S,6S,9S,14aS)-9-[(2S)-butan-2-yl]-6-[(1R)-1-hydroxyethyl]-3-[(4-methoxyphenyl)methyl]-tetradecahydropyrrolo[1,2-a]1,4,7,10-tetraazacyclododecane-1,4,7,10-tetrone

> <JCHEM_LOGP>
0.3269736346666669

> <JCHEM_MDDR_LIKE_RULE>
1

> <JCHEM_NUMBER_OF_RINGS>
3

> <JCHEM_PHYSIOLOGICAL_CHARGE>
0

> <JCHEM_PKA>
11.144565566255766

> <JCHEM_PKA_STRONGEST_ACIDIC>
10.550541706368168

> <JCHEM_PKA_STRONGEST_BASIC>
-2.9371195733895457

> <JCHEM_POLAR_SURFACE_AREA>
137.07

> <JCHEM_REFRACTIVITY>
127.52

> <JCHEM_ROTATABLE_BOND_COUNT>
6

> <JCHEM_RULE_OF_FIVE>
1

> <JCHEM_TRADITIONAL_IUPAC>
(3S,6S,9S,14aS)-9-[(2S)-butan-2-yl]-6-[(1R)-1-hydroxyethyl]-3-[(4-methoxyphenyl)methyl]-decahydropyrrolo[1,2-a]1,4,7,10-tetraazacyclododecane-1,4,7,10-tetrone

> <JCHEM_VEBER_RULE>
0

$$$$

HEADER    PROTEIN                                 03-JAN-24   NONE
TITLE     NULL                                                        
COMPND    NULL                                                        
SOURCE    NULL                                                        
KEYWDS    NULL                                                        
EXPDTA    NULL                                                        
AUTHOR    Marvin                                                      
REVDAT   1   03-JAN-24         0                                  
HETATM    1  O   UNK     0      -0.198   5.267   0.000  0.00  0.00           O+0
HETATM    2  C   UNK     0       1.221   4.669   0.000  0.00  0.00           C+0
HETATM    3  N   UNK     0       1.413   3.141   0.000  0.00  0.00           N+0
HETATM    4  C   UNK     0       0.814   1.722   0.000  0.00  0.00           C+0
HETATM    5  C   UNK     0      -0.720   1.852   0.000  0.00  0.00           C+0
HETATM    6  C   UNK     0      -1.070   3.352   0.000  0.00  0.00           C+0
HETATM    7  C   UNK     0       0.248   4.148   0.000  0.00  0.00           C+0
HETATM    8  C   UNK     0       1.744   0.494   0.000  0.00  0.00           C+0
HETATM    9  N   UNK     0       3.272   0.685   0.000  0.00  0.00           N+0
HETATM   10  C   UNK     0       4.691   0.087   0.000  0.00  0.00           C+0
HETATM   11  C   UNK     0       4.883  -1.441   0.000  0.00  0.00           C+0
HETATM   12  C   UNK     0       6.302  -2.039   0.000  0.00  0.00           C+0
HETATM   13  C   UNK     0       7.529  -1.109   0.000  0.00  0.00           C+0
HETATM   14  C   UNK     0       8.948  -1.708   0.000  0.00  0.00           C+0
HETATM   15  C   UNK     0       9.140  -3.236   0.000  0.00  0.00           C+0
HETATM   16  O   UNK     0      10.559  -3.834   0.000  0.00  0.00           O+0
HETATM   17  C   UNK     0      10.750  -5.362   0.000  0.00  0.00           C+0
HETATM   18  C   UNK     0       7.912  -4.165   0.000  0.00  0.00           C+0
HETATM   19  C   UNK     0       6.493  -3.567   0.000  0.00  0.00           C+0
HETATM   20  C   UNK     0       5.919   1.017   0.000  0.00  0.00           C+0
HETATM   21  N   UNK     0       5.727   2.545   0.000  0.00  0.00           N+0
HETATM   22  C   UNK     0       6.326   3.964   0.000  0.00  0.00           C+0
HETATM   23  C   UNK     0       7.854   4.155   0.000  0.00  0.00           C+0
HETATM   24  O   UNK     0       8.452   5.575   0.000  0.00  0.00           O+0
HETATM   25  C   UNK     0       8.784   2.928   0.000  0.00  0.00           C+0
HETATM   26  O   UNK     0       7.338   0.419   0.000  0.00  0.00           O+0
HETATM   27  O   UNK     0       1.146  -0.925   0.000  0.00  0.00           O+0
HETATM   28  C   UNK     0       2.449   5.599   0.000  0.00  0.00           C+0
HETATM   29  C   UNK     0       2.257   7.127   0.000  0.00  0.00           C+0
HETATM   30  C   UNK     0       0.838   7.725   0.000  0.00  0.00           C+0
HETATM   31  C   UNK     0       3.485   8.056   0.000  0.00  0.00           C+0
HETATM   32  C   UNK     0       3.294   9.584   0.000  0.00  0.00           C+0
HETATM   33  N   UNK     0       3.868   5.000   0.000  0.00  0.00           N+0
HETATM   34  C   UNK     0       5.396   5.192   0.000  0.00  0.00           C+0
HETATM   35  O   UNK     0       5.994   6.611   0.000  0.00  0.00           O+0
CONECT    1    2                                                            
CONECT    2    1    3   28                                                  
CONECT    3    2    4    7                                                  
CONECT    4    3    5    8                                                  
CONECT    5    4    6                                                       
CONECT    6    5    7                                                       
CONECT    7    6    3                                                       
CONECT    8    4    9   27                                                  
CONECT    9    8   10                                                       
CONECT   10    9   11   20                                                  
CONECT   11   10   12                                                       
CONECT   12   11   13   19                                                  
CONECT   13   12   14                                                       
CONECT   14   13   15                                                       
CONECT   15   14   16   18                                                  
CONECT   16   15   17                                                       
CONECT   17   16                                                            
CONECT   18   15   19                                                       
CONECT   19   18   12                                                       
CONECT   20   10   21   26                                                  
CONECT   21   20   22                                                       
CONECT   22   21   23   34                                                  
CONECT   23   22   24   25                                                  
CONECT   24   23                                                            
CONECT   25   23                                                            
CONECT   26   20                                                            
CONECT   27    8                                                            
CONECT   28    2   29   33                                                  
CONECT   29   28   30   31                                                  
CONECT   30   29                                                            
CONECT   31   29   32                                                       
CONECT   32   31                                                            
CONECT   33   28   34                                                       
CONECT   34   33   22   35                                                  
CONECT   35   34                                                            
MASTER        0    0    0    0    0    0    0    0   35    0   74    0
END

View in JSmol

Synonyms

Not Available

Chemical Formula

C₂₅H₃₆N₄O₆

Average Mass

488.5850 Da

Monoisotopic Mass

488.26348 Da

IUPAC Name

(3S,6S,9S,14aS)-9-[(2S)-butan-2-yl]-6-[(1R)-1-hydroxyethyl]-3-[(4-methoxyphenyl)methyl]-tetradecahydropyrrolo[1,2-a]1,4,7,10-tetraazacyclododecane-1,4,7,10-tetrone

Traditional Name

(3S,6S,9S,14aS)-9-[(2S)-butan-2-yl]-6-[(1R)-1-hydroxyethyl]-3-[(4-methoxyphenyl)methyl]-decahydropyrrolo[1,2-a]1,4,7,10-tetraazacyclododecane-1,4,7,10-tetrone

CAS Registry Number

Not Available

SMILES

CC[C@H](C)[C@@H]1NC(=O)[C@@H](NC(=O)[C@H](CC2=CC=C(OC)C=C2)NC(=O)[C@@H]2CCCN2C1=O)[C@@H](C)O

InChI Identifier

InChI=1S/C25H36N4O6/c1-5-14(2)20-25(34)29-12-6-7-19(29)23(32)26-18(13-16-8-10-17(35-4)11-9-16)22(31)28-21(15(3)30)24(33)27-20/h8-11,14-15,18-21,30H,5-7,12-13H2,1-4H3,(H,26,32)(H,27,33)(H,28,31)/t14-,15+,18-,19-,20-,21-/m0/s1

InChI Key

YMLCBZYAEKPXDK-MYMZKXAHSA-N

Experimental Spectra

Spectrum Type	Description	Depositor Email	Depositor Organization	Depositor	Deposition Date	View
1D NMR	¹³C NMR Spectrum (1D, 151 MHz, C5D5N, experimental)	ganml@imb.pumc.edu.cn	Not Available	Not Available	2024-05-03	View Spectrum
1D NMR	¹H NMR Spectrum (1D, 600 MHz, C5D5N, experimental)	ganml@imb.pumc.edu.cn	Not Available	Not Available	2024-05-03	View Spectrum

Predicted Spectra

Not Available

Chemical Shift Submissions

Not Available

Species

Species of Origin

Species Name	Source	Reference
insulicola IMB18-072		Not Available

Chemical Taxonomy

Description

This compound belongs to the class of organic compounds known as oligopeptides. These are organic compounds containing a sequence of between three and ten alpha-amino acids joined by peptide bonds.

Kingdom

Organic compounds

Super Class

Organic acids and derivatives

Class

Carboxylic acids and derivatives

Sub Class

Amino acids, peptides, and analogues

Direct Parent

Oligopeptides

Alternative Parents

Substituents

Alpha-oligopeptide
Cyclic alpha peptide
Isoleucine or derivatives
N-acyl-alpha amino acid or derivatives
Alpha-amino acid amide
Alpha-amino acid or derivatives
N-substituted-alpha-amino acid
Phenoxy compound
Methoxybenzene
Pyrrolidine-2-carboxamide
Pyrrolidine carboxylic acid or derivatives
Phenol ether
N-acylpyrrolidine
Anisole
Alkyl aryl ether
Fatty acyl
Benzenoid
N-acyl-amine
Fatty amide
Monocyclic benzene moiety
Tertiary carboxylic acid amide
Pyrrolidine
Secondary alcohol
Lactam
Carboxamide group
Azacycle
Organoheterocyclic compound
Ether
Organic nitrogen compound
Organic oxygen compound
Organopnictogen compound
Organic oxide
Hydrocarbon derivative
Organooxygen compound
Organonitrogen compound
Alcohol
Aromatic heteropolycyclic compound

Molecular Framework

Aromatic heteropolycyclic compounds

External Descriptors

Not Available

Physical Properties

State

Not Available

Experimental Properties

Property	Value	Reference
Melting Point	Not Available	Not Available
Boiling Point	Not Available	Not Available
Water Solubility	Not Available	Not Available
LogP	Not Available	Not Available

Predicted Properties

Property	Value	Source
logP	0.33	ChemAxon
pKa (Strongest Acidic)	10.55	ChemAxon
pKa (Strongest Basic)	-2.9	ChemAxon
Physiological Charge	0	ChemAxon
Hydrogen Acceptor Count	6	ChemAxon
Hydrogen Donor Count	4	ChemAxon
Polar Surface Area	137.07 Å²	ChemAxon
Rotatable Bond Count	6	ChemAxon
Refractivity	127.52 m³·mol⁻¹	ChemAxon
Polarizability	50.86 Å³	ChemAxon
Number of Rings	3	ChemAxon
Bioavailability	Yes	ChemAxon
Rule of Five	Yes	ChemAxon
Ghose Filter	No	ChemAxon
Veber's Rule	No	ChemAxon
MDDR-like Rule	Yes	ChemAxon

External Links

HMDB ID

Not Available

DrugBank ID

Not Available

Phenol Explorer Compound ID

Not Available

FoodDB ID

Not Available

KNApSAcK ID

Not Available

Chemspider ID

Not Available

KEGG Compound ID

Not Available

BioCyc ID

Not Available

BiGG ID

Not Available

Wikipedia Link

Not Available

METLIN ID

Not Available

PubChem Compound

Not Available

PDB ID

Not Available

ChEBI ID

Not Available

Good Scents ID

Not Available

References

General References

Li Q, Li S, Li S, Hao X, Wang A, Si S, Xu Y, Shu J, Gan M: Antimicrobial and Anti-inflammatory Cyclic Tetrapeptides from the Co-cultures of Two Marine-Derived Fungi. J Nat Prod. 2024 Feb 23;87(2):365-370. doi: 10.1021/acs.jnatprod.3c01115. Epub 2024 Jan 26. [PubMed:38276888 ]

Showing NP-Card for Violaceotide B (NP0332298)

MOL for NP0332298 (Violaceotide B)

3D MOL for NP0332298 (Violaceotide B)

3D SDF for NP0332298 (Violaceotide B)

3D-SDF for NP0332298 (Violaceotide B)

PDB for NP0332298 (Violaceotide B)

3D PDB for NP0332298 (Violaceotide B)

SMILES for NP0332298 (Violaceotide B)

INCHI for NP0332298 (Violaceotide B)

Structure for NP0332298 (Violaceotide B)

3D Structure for NP0332298 (Violaceotide B)