NP-MRD: Showing NP-Card for 2-amino-4-[(2-carboxy-1-phenylethyl)-c-hydroxycarbonimidoyl]butanoic acid (NP0207689)

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Record Information

Version

2.0

Created at

2022-09-05 04:24:08 UTC

Updated at

2022-09-05 04:24:08 UTC

NP-MRD ID

NP0207689

Secondary Accession Numbers

None

Natural Product Identification

Common Name

2-amino-4-[(2-carboxy-1-phenylethyl)-c-hydroxycarbonimidoyl]butanoic acid

Description

L-gamma-Glutamyl-beta-phenyl-beta-L-alanine, also known as L-γ-glutamyl-β-phenyl-β-L-alanine, belongs to the class of organic compounds known as glutamine and derivatives. Glutamine and derivatives are compounds containing glutamine or a derivative thereof resulting from reaction of glutamine at the amino group or the carboxy group, or from the replacement of any hydrogen of glycine by a heteroatom. L-gamma-Glutamyl-beta-phenyl-beta-L-alanine is a very strong basic compound (based on its pKa). Outside of the human body, L-gamma-Glutamyl-beta-phenyl-beta-L-alanine has been detected, but not quantified in, pulses. 2-amino-4-[(2-carboxy-1-phenylethyl)-c-hydroxycarbonimidoyl]butanoic acid is found in Azolla filiculoides. This could make L-gamma-glutamyl-beta-phenyl-beta-L-alanine a potential biomarker for the consumption of these foods.

Structure

MOL 3D MOL SDF PDB SMILES InChI

     RDKit          3D

 39 39  0  0  0  0  0  0  0  0999 V2000
    4.3855   -0.7783   -1.5256 N   0  0  0  0  0  0  0  0  0  0  0  0
    4.3096   -0.9832   -0.0830 C   0  0  2  0  0  0  0  0  0  0  0  0
    3.2366   -0.0403    0.4236 C   0  0  0  0  0  0  0  0  0  0  0  0
    1.9505   -0.4430   -0.2933 C   0  0  0  0  0  0  0  0  0  0  0  0
    0.8263    0.4265    0.1378 C   0  0  0  0  0  0  0  0  0  0  0  0
    1.0571    1.3170    0.9958 O   0  0  0  0  0  0  0  0  0  0  0  0
   -0.4381    0.2084   -0.4368 N   0  0  0  0  0  0  0  0  0  0  0  0
   -1.6226    1.0080   -0.0843 C   0  0  1  0  0  0  0  0  0  0  0  0
   -2.1876    1.5635   -1.3563 C   0  0  0  0  0  0  0  0  0  0  0  0
   -3.3666    2.4274   -1.0977 C   0  0  0  0  0  0  0  0  0  0  0  0
   -3.6953    2.6590    0.0902 O   0  0  0  0  0  0  0  0  0  0  0  0
   -4.0843    2.9631   -2.1244 O   0  0  0  0  0  0  0  0  0  0  0  0
   -2.5278   -0.0241    0.5441 C   0  0  0  0  0  0  0  0  0  0  0  0
   -3.7849   -0.3109    0.1120 C   0  0  0  0  0  0  0  0  0  0  0  0
   -4.5399   -1.2742    0.7778 C   0  0  0  0  0  0  0  0  0  0  0  0
   -4.0749   -1.9631    1.8663 C   0  0  0  0  0  0  0  0  0  0  0  0
   -2.7984   -1.6696    2.3014 C   0  0  0  0  0  0  0  0  0  0  0  0
   -2.0374   -0.7198    1.6557 C   0  0  0  0  0  0  0  0  0  0  0  0
    5.6128   -0.7407    0.5661 C   0  0  0  0  0  0  0  0  0  0  0  0
    5.7027   -0.8996    1.8022 O   0  0  0  0  0  0  0  0  0  0  0  0
    6.7033   -0.3491   -0.1686 O   0  0  0  0  0  0  0  0  0  0  0  0
    4.0629    0.1915   -1.7588 H   0  0  0  0  0  0  0  0  0  0  0  0
    3.7566   -1.4845   -1.9620 H   0  0  0  0  0  0  0  0  0  0  0  0
    4.0162   -2.0362    0.1016 H   0  0  0  0  0  0  0  0  0  0  0  0
    3.4752    1.0051    0.1193 H   0  0  0  0  0  0  0  0  0  0  0  0
    3.1254   -0.0509    1.5121 H   0  0  0  0  0  0  0  0  0  0  0  0
    2.1165   -0.4204   -1.3886 H   0  0  0  0  0  0  0  0  0  0  0  0
    1.6665   -1.4859   -0.0440 H   0  0  0  0  0  0  0  0  0  0  0  0
   -0.6005   -0.5316   -1.1421 H   0  0  0  0  0  0  0  0  0  0  0  0
   -1.4135    1.7600    0.6735 H   0  0  0  0  0  0  0  0  0  0  0  0
   -1.4509    2.1959   -1.9028 H   0  0  0  0  0  0  0  0  0  0  0  0
   -2.4331    0.7406   -2.0682 H   0  0  0  0  0  0  0  0  0  0  0  0
   -3.9578    3.8768   -2.5385 H   0  0  0  0  0  0  0  0  0  0  0  0
   -4.2022    0.1709   -0.7297 H   0  0  0  0  0  0  0  0  0  0  0  0
   -5.5392   -1.4952    0.4268 H   0  0  0  0  0  0  0  0  0  0  0  0
   -4.6712   -2.7079    2.3729 H   0  0  0  0  0  0  0  0  0  0  0  0
   -2.4151   -2.2177    3.1745 H   0  0  0  0  0  0  0  0  0  0  0  0
   -1.0332   -0.5191    2.0331 H   0  0  0  0  0  0  0  0  0  0  0  0
    6.8708    0.6315   -0.4424 H   0  0  0  0  0  0  0  0  0  0  0  0
  1  2  1  0
  2  3  1  0
  3  4  1  0
  4  5  1  0
  5  6  2  0
  5  7  1  0
  7  8  1  0
  8  9  1  0
  9 10  1  0
 10 12  1  0
 10 11  2  0
  8 13  1  0
 13 14  2  0
 14 15  1  0
 15 16  2  0
 16 17  1  0
 17 18  2  0
  2 19  1  0
 19 21  1  0
 19 20  2  0
 18 13  1  0
  1 22  1  0
  1 23  1  0
  2 24  1  6
  3 25  1  0
  3 26  1  0
  4 27  1  0
  4 28  1  0
  7 29  1  0
  8 30  1  1
  9 31  1  0
  9 32  1  0
 12 33  1  0
 14 34  1  0
 15 35  1  0
 16 36  1  0
 17 37  1  0
 18 38  1  0
 21 39  1  0
M  END


  Mrv0541 02241211322D          

 21 21  0  0  0  0            999 V2000
    2.8055    0.6410    0.0000 O   0  0  0  0  0  0  0  0  0  0  0  0
    2.8055   -0.2409    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    3.5270   -0.6410    0.0000 O   0  0  0  0  0  0  0  0  0  0  0  0
    2.0840   -1.4426    0.0000 N   0  0  0  0  0  0  0  0  0  0  0  0
    2.0840   -0.6410    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    1.3625   -0.2409    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    0.7211   -0.6410    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
   -0.0004   -0.2409    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
   -0.0004    0.6410    0.0000 O   0  0  0  0  0  0  0  0  0  0  0  0
   -1.8435    1.8435    0.0000 O   0  0  0  0  0  0  0  0  0  0  0  0
   -2.0840    1.0418    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
   -2.8857    0.9616    0.0000 O   0  0  0  0  0  0  0  0  0  0  0  0
   -1.4426    0.6410    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
   -1.4426   -0.1607    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
   -0.7211   -0.5608    0.0000 N   0  0  0  0  0  0  0  0  0  0  0  0
   -2.0840   -1.4426    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
   -2.8055   -1.8435    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
   -3.5270   -1.4426    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
   -3.5270   -0.6410    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
   -2.8055   -0.2409    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
   -2.0840   -0.6410    0.0000 C   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
  2  5  1  0  0  0  0
  4  5  1  0  0  0  0
  5  6  1  0  0  0  0
  6  7  1  0  0  0  0
  7  8  1  0  0  0  0
  8  9  2  0  0  0  0
  8 15  1  0  0  0  0
 10 11  2  0  0  0  0
 11 12  1  0  0  0  0
 11 13  1  0  0  0  0
 13 14  1  0  0  0  0
 14 15  1  0  0  0  0
 14 21  1  0  0  0  0
 16 17  2  0  0  0  0
 16 21  1  0  0  0  0
 17 18  1  0  0  0  0
 18 19  2  0  0  0  0
 19 20  1  0  0  0  0
 20 21  2  0  0  0  0
M  END
> <DATABASE_ID>
NP0207689

> <DATABASE_NAME>
NP-MRD

> <SMILES>
NC(CCC(=O)NC(CC(O)=O)C1=CC=CC=C1)C(O)=O

> <INCHI_IDENTIFIER>
InChI=1S/C14H18N2O5/c15-10(14(20)21)6-7-12(17)16-11(8-13(18)19)9-4-2-1-3-5-9/h1-5,10-11H,6-8,15H2,(H,16,17)(H,18,19)(H,20,21)

> <INCHI_KEY>
IDPGQVFKQDLMJA-UHFFFAOYSA-N

> <FORMULA>
C14H18N2O5

> <MOLECULAR_WEIGHT>
294.3031

> <EXACT_MASS>
294.121571696

> <JCHEM_ACCEPTOR_COUNT>
6

> <JCHEM_AVERAGE_POLARIZABILITY>
29.08906410908154

> <JCHEM_BIOAVAILABILITY>
1

> <JCHEM_DONOR_COUNT>
4

> <JCHEM_FORMAL_CHARGE>
0

> <JCHEM_GHOSE_FILTER>
0

> <JCHEM_IUPAC>
2-amino-4-[(2-carboxy-1-phenylethyl)carbamoyl]butanoic acid

> <ALOGPS_LOGP>
-2.30

> <JCHEM_LOGP>
-2.319947505660497

> <ALOGPS_LOGS>
-2.88

> <JCHEM_MDDR_LIKE_RULE>
0

> <JCHEM_NUMBER_OF_RINGS>
1

> <JCHEM_PHYSIOLOGICAL_CHARGE>
-1

> <JCHEM_PKA>
4.361805952333936

> <JCHEM_PKA_STRONGEST_ACIDIC>
1.848165810400201

> <JCHEM_PKA_STRONGEST_BASIC>
9.312089935338163

> <JCHEM_POLAR_SURFACE_AREA>
129.71999999999997

> <JCHEM_REFRACTIVITY>
73.0734

> <JCHEM_ROTATABLE_BOND_COUNT>
8

> <JCHEM_RULE_OF_FIVE>
1

> <ALOGPS_SOLUBILITY>
3.85e-01 g/l

> <JCHEM_TRADITIONAL_IUPAC>
2-amino-4-[(2-carboxy-1-phenylethyl)carbamoyl]butanoic acid

> <JCHEM_VEBER_RULE>
0

$$$$

HEADER    PROTEIN                                 24-FEB-12   NONE
TITLE     NULL                                                        
COMPND    NULL                                                        
SOURCE    NULL                                                        
KEYWDS    NULL                                                        
EXPDTA    NULL                                                        
AUTHOR    Marvin                                                      
REVDAT   1   24-FEB-12         0                                  
HETATM    1  O   UNK     0       5.237   1.197   0.000  0.00  0.00           O+0
HETATM    2  C   UNK     0       5.237  -0.450   0.000  0.00  0.00           C+0
HETATM    3  O   UNK     0       6.584  -1.197   0.000  0.00  0.00           O+0
HETATM    4  N   UNK     0       3.890  -2.693   0.000  0.00  0.00           N+0
HETATM    5  C   UNK     0       3.890  -1.197   0.000  0.00  0.00           C+0
HETATM    6  C   UNK     0       2.543  -0.450   0.000  0.00  0.00           C+0
HETATM    7  C   UNK     0       1.346  -1.197   0.000  0.00  0.00           C+0
HETATM    8  C   UNK     0      -0.001  -0.450   0.000  0.00  0.00           C+0
HETATM    9  O   UNK     0      -0.001   1.197   0.000  0.00  0.00           O+0
HETATM   10  O   UNK     0      -3.441   3.441   0.000  0.00  0.00           O+0
HETATM   11  C   UNK     0      -3.890   1.945   0.000  0.00  0.00           C+0
HETATM   12  O   UNK     0      -5.387   1.795   0.000  0.00  0.00           O+0
HETATM   13  C   UNK     0      -2.693   1.197   0.000  0.00  0.00           C+0
HETATM   14  C   UNK     0      -2.693  -0.300   0.000  0.00  0.00           C+0
HETATM   15  N   UNK     0      -1.346  -1.047   0.000  0.00  0.00           N+0
HETATM   16  C   UNK     0      -3.890  -2.693   0.000  0.00  0.00           C+0
HETATM   17  C   UNK     0      -5.237  -3.441   0.000  0.00  0.00           C+0
HETATM   18  C   UNK     0      -6.584  -2.693   0.000  0.00  0.00           C+0
HETATM   19  C   UNK     0      -6.584  -1.197   0.000  0.00  0.00           C+0
HETATM   20  C   UNK     0      -5.237  -0.450   0.000  0.00  0.00           C+0
HETATM   21  C   UNK     0      -3.890  -1.197   0.000  0.00  0.00           C+0
CONECT    1    2                                                            
CONECT    2    1    3    5                                                  
CONECT    3    2                                                            
CONECT    4    5                                                            
CONECT    5    2    4    6                                                  
CONECT    6    5    7                                                       
CONECT    7    6    8                                                       
CONECT    8    7    9   15                                                  
CONECT    9    8                                                            
CONECT   10   11                                                            
CONECT   11   10   12   13                                                  
CONECT   12   11                                                            
CONECT   13   11   14                                                       
CONECT   14   13   15   21                                                  
CONECT   15    8   14                                                       
CONECT   16   17   21                                                       
CONECT   17   16   18                                                       
CONECT   18   17   19                                                       
CONECT   19   18   20                                                       
CONECT   20   19   21                                                       
CONECT   21   14   16   20                                                  
MASTER        0    0    0    0    0    0    0    0   21    0   42    0
END

View in JSmol

Synonyms

Value	Source
L-g-Glutamyl-b-phenyl-b-L-alanine	Generator
L-Γ-glutamyl-β-phenyl-β-L-alanine	Generator
2-Amino-4-[(2-carboxy-1-phenylethyl)-C-hydroxycarbonimidoyl]butanoate	Generator

Chemical Formula

C₁₄H₁₈N₂O₅

Average Mass

294.3031 Da

Monoisotopic Mass

294.12157 Da

IUPAC Name

2-amino-4-[(2-carboxy-1-phenylethyl)carbamoyl]butanoic acid

Traditional Name

2-amino-4-[(2-carboxy-1-phenylethyl)carbamoyl]butanoic acid

CAS Registry Number

Not Available

SMILES

NC(CCC(=O)NC(CC(O)=O)C1=CC=CC=C1)C(O)=O

InChI Identifier

InChI=1S/C14H18N2O5/c15-10(14(20)21)6-7-12(17)16-11(8-13(18)19)9-4-2-1-3-5-9/h1-5,10-11H,6-8,15H2,(H,16,17)(H,18,19)(H,20,21)

InChI Key

IDPGQVFKQDLMJA-UHFFFAOYSA-N

Experimental Spectra

Not Available

Predicted Spectra

Spectrum Type	Description	Depositor ID	Depositor Organization	Depositor	Deposition Date	View
1D NMR	¹³C NMR Spectrum (1D, 25 MHz, H₂O, predicted)	Wishart Lab	Wishart Lab	David Wishart	2021-06-20	View Spectrum
1D NMR	¹H NMR Spectrum (1D, 100 MHz, H₂O, predicted)	Wishart Lab	Wishart Lab	David Wishart	2021-06-20	View Spectrum
1D NMR	¹³C NMR Spectrum (1D, 252 MHz, H₂O, predicted)	Wishart Lab	Wishart Lab	David Wishart	2021-06-20	View Spectrum
1D NMR	¹H NMR Spectrum (1D, 1000 MHz, H₂O, predicted)	Wishart Lab	Wishart Lab	David Wishart	2021-06-20	View Spectrum
1D NMR	¹³C NMR Spectrum (1D, 50 MHz, H₂O, predicted)	Wishart Lab	Wishart Lab	David Wishart	2021-06-20	View Spectrum
1D NMR	¹H NMR Spectrum (1D, 200 MHz, H₂O, predicted)	Wishart Lab	Wishart Lab	David Wishart	2021-06-20	View Spectrum
1D NMR	¹³C NMR Spectrum (1D, 75 MHz, H₂O, predicted)	Wishart Lab	Wishart Lab	David Wishart	2021-06-20	View Spectrum
1D NMR	¹H NMR Spectrum (1D, 300 MHz, H₂O, predicted)	Wishart Lab	Wishart Lab	David Wishart	2021-06-20	View Spectrum
1D NMR	¹³C NMR Spectrum (1D, 101 MHz, H₂O, predicted)	Wishart Lab	Wishart Lab	David Wishart	2021-06-20	View Spectrum
1D NMR	¹H NMR Spectrum (1D, 400 MHz, H₂O, predicted)	Wishart Lab	Wishart Lab	David Wishart	2021-06-20	View Spectrum
1D NMR	¹³C NMR Spectrum (1D, 126 MHz, H₂O, predicted)	Wishart Lab	Wishart Lab	David Wishart	2021-06-20	View Spectrum
1D NMR	¹H NMR Spectrum (1D, 500 MHz, H₂O, predicted)	Wishart Lab	Wishart Lab	David Wishart	2021-06-20	View Spectrum
1D NMR	¹³C NMR Spectrum (1D, 151 MHz, H₂O, predicted)	Wishart Lab	Wishart Lab	David Wishart	2021-06-20	View Spectrum
1D NMR	¹H NMR Spectrum (1D, 600 MHz, H₂O, predicted)	Wishart Lab	Wishart Lab	David Wishart	2021-06-20	View Spectrum
1D NMR	¹³C NMR Spectrum (1D, 176 MHz, H₂O, predicted)	Wishart Lab	Wishart Lab	David Wishart	2021-06-20	View Spectrum
1D NMR	¹H NMR Spectrum (1D, 700 MHz, H₂O, predicted)	Wishart Lab	Wishart Lab	David Wishart	2021-06-20	View Spectrum
1D NMR	¹³C NMR Spectrum (1D, 201 MHz, H₂O, predicted)	Wishart Lab	Wishart Lab	David Wishart	2021-06-20	View Spectrum
1D NMR	¹H NMR Spectrum (1D, 800 MHz, H₂O, predicted)	Wishart Lab	Wishart Lab	David Wishart	2021-06-20	View Spectrum
1D NMR	¹³C NMR Spectrum (1D, 226 MHz, H₂O, predicted)	Wishart Lab	Wishart Lab	David Wishart	2021-06-20	View Spectrum
1D NMR	¹H NMR Spectrum (1D, 900 MHz, H₂O, predicted)	Wishart Lab	Wishart Lab	David Wishart	2021-06-20	View Spectrum

Chemical Shift Submissions

Not Available

Species

Species of Origin

Species Name	Source	Reference
Azolla filiculoides	LOTUS Database	35616633

Chemical Taxonomy

Description

Belongs to the class of organic compounds known as glutamine and derivatives. Glutamine and derivatives are compounds containing glutamine or a derivative thereof resulting from reaction of glutamine at the amino group or the carboxy group, or from the replacement of any hydrogen of glycine by a heteroatom.

Kingdom

Organic compounds

Super Class

Organic acids and derivatives

Class

Carboxylic acids and derivatives

Sub Class

Amino acids, peptides, and analogues

Direct Parent

Glutamine and derivatives

Alternative Parents

Substituents

Glutamine or derivatives
Beta amino acid or derivatives
3-phenylpropanoic-acid
Alpha-amino acid
Monocyclic benzene moiety
Fatty acyl
Benzenoid
Dicarboxylic acid or derivatives
Fatty amide
N-acyl-amine
Carboxamide group
Amino acid
Secondary carboxylic acid amide
Carboxylic acid
Organic nitrogen compound
Organonitrogen compound
Primary aliphatic amine
Organooxygen compound
Primary amine
Hydrocarbon derivative
Organic oxide
Carbonyl group
Organopnictogen compound
Organic oxygen compound
Amine
Aromatic homomonocyclic compound

Molecular Framework

Aromatic homomonocyclic 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	-2.3	ALOGPS
logP	-2.3	ChemAxon
logS	-2.9	ALOGPS
pKa (Strongest Acidic)	1.85	ChemAxon
pKa (Strongest Basic)	9.31	ChemAxon
Physiological Charge	-1	ChemAxon
Hydrogen Acceptor Count	6	ChemAxon
Hydrogen Donor Count	4	ChemAxon
Polar Surface Area	129.72 Å²	ChemAxon
Rotatable Bond Count	8	ChemAxon
Refractivity	73.07 m³·mol⁻¹	ChemAxon
Polarizability	29.09 Å³	ChemAxon
Number of Rings	1	ChemAxon
Bioavailability	Yes	ChemAxon
Rule of Five	Yes	ChemAxon
Ghose Filter	No	ChemAxon
Veber's Rule	No	ChemAxon
MDDR-like Rule	No	ChemAxon

External Links

HMDB ID

HMDB0038514

DrugBank ID

Not Available

Phenol Explorer Compound ID

Not Available

FoodDB ID

FDB017894

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

131752386

PDB ID

Not Available

ChEBI ID

Not Available

Good Scents ID

Not Available

References

General References

LOTUS database [Link]

Showing NP-Card for 2-amino-4-[(2-carboxy-1-phenylethyl)-c-hydroxycarbonimidoyl]butanoic acid (NP0207689)

MOL for NP0207689 (2-amino-4-[(2-carboxy-1-phenylethyl)-c-hydroxycarbonimidoyl]butanoic acid)

3D MOL for NP0207689 (2-amino-4-[(2-carboxy-1-phenylethyl)-c-hydroxycarbonimidoyl]butanoic acid)

3D SDF for NP0207689 (2-amino-4-[(2-carboxy-1-phenylethyl)-c-hydroxycarbonimidoyl]butanoic acid)

3D-SDF for NP0207689 (2-amino-4-[(2-carboxy-1-phenylethyl)-c-hydroxycarbonimidoyl]butanoic acid)

PDB for NP0207689 (2-amino-4-[(2-carboxy-1-phenylethyl)-c-hydroxycarbonimidoyl]butanoic acid)

3D PDB for NP0207689 (2-amino-4-[(2-carboxy-1-phenylethyl)-c-hydroxycarbonimidoyl]butanoic acid)

SMILES for NP0207689 (2-amino-4-[(2-carboxy-1-phenylethyl)-c-hydroxycarbonimidoyl]butanoic acid)

INCHI for NP0207689 (2-amino-4-[(2-carboxy-1-phenylethyl)-c-hydroxycarbonimidoyl]butanoic acid)

Structure for NP0207689 (2-amino-4-[(2-carboxy-1-phenylethyl)-c-hydroxycarbonimidoyl]butanoic acid)

3D Structure for NP0207689 (2-amino-4-[(2-carboxy-1-phenylethyl)-c-hydroxycarbonimidoyl]butanoic acid)