NP-MRD: Showing NP-Card for (2r,3r)-2-(3,4-dihydroxyphenyl)-8-[(2s,4r)-2-(3,4-dihydroxyphenyl)-7-hydroxy-3,4-dihydro-2h-1-benzopyran-4-yl]-3,4-dihydro-2h-1-benzopyran-3,5,7-triol (NP0173577)

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Record Information

Version

2.0

Created at

2022-09-03 10:44:19 UTC

Updated at

2022-09-03 10:44:19 UTC

NP-MRD ID

NP0173577

Secondary Accession Numbers

None

Natural Product Identification

Common Name

(2r,3r)-2-(3,4-dihydroxyphenyl)-8-[(2s,4r)-2-(3,4-dihydroxyphenyl)-7-hydroxy-3,4-dihydro-2h-1-benzopyran-4-yl]-3,4-dihydro-2h-1-benzopyran-3,5,7-triol

Description

2Alpha,2'alpha-Bis(3,4-dihydroxyphenyl)-3,3',4,4'-tetrahydro-4beta,8'-bi[2H-1-benzopyran]-3'alpha,5',7,7'-tetrol belongs to the class of organic compounds known as biflavonoids and polyflavonoids. These are organic compounds containing at least two flavan/flavone units. These units are usually linked through CC or C-O-C bonds. Some examples include C2-O-C3, C2-O-C4, C3'-C3''', and C6-C8''. (2r,3r)-2-(3,4-dihydroxyphenyl)-8-[(2s,4r)-2-(3,4-dihydroxyphenyl)-7-hydroxy-3,4-dihydro-2h-1-benzopyran-4-yl]-3,4-dihydro-2h-1-benzopyran-3,5,7-triol is found in Senna petersiana. Based on a literature review very few articles have been published on 2alpha,2'alpha-Bis(3,4-dihydroxyphenyl)-3,3',4,4'-tetrahydro-4beta,8'-bi[2H-1-benzopyran]-3'alpha,5',7,7'-tetrol.

Structure

MOL 3D MOL SDF PDB SMILES InChI


  Mrv1652309032212442D          

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M  END

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M  END


  Mrv1652309032212442D          

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  3  4  1  0  0  0  0
  4  5  2  0  0  0  0
  5  6  1  0  0  0  0
  6  7  2  0  0  0  0
  2  7  1  0  0  0  0
  6  8  1  0  0  0  0
  8  9  1  0  0  0  0
  9 10  1  6  0  0  0
 10 11  2  0  0  0  0
 11 12  1  0  0  0  0
 12 13  2  0  0  0  0
 13 14  1  0  0  0  0
 13 15  1  0  0  0  0
 15 16  1  0  0  0  0
 15 17  2  0  0  0  0
 10 17  1  0  0  0  0
  9 18  1  0  0  0  0
 18 19  1  0  0  0  0
  5 19  1  0  0  0  0
 19 20  1  1  0  0  0
 20 21  2  0  0  0  0
 21 22  1  0  0  0  0
 21 23  1  0  0  0  0
 23 24  2  0  0  0  0
 24 25  1  0  0  0  0
 24 26  1  0  0  0  0
 26 27  2  0  0  0  0
 20 27  1  0  0  0  0
 27 28  1  0  0  0  0
 28 29  1  0  0  0  0
 29 30  1  6  0  0  0
 30 31  2  0  0  0  0
 31 32  1  0  0  0  0
 32 33  2  0  0  0  0
 33 34  1  0  0  0  0
 33 35  1  0  0  0  0
 35 36  1  0  0  0  0
 35 37  2  0  0  0  0
 30 37  1  0  0  0  0
 29 38  1  0  0  0  0
 38 39  1  6  0  0  0
 38 40  1  0  0  0  0
 26 40  1  0  0  0  0
M  END
> <DATABASE_ID>
NP0173577

> <DATABASE_NAME>
NP-MRD

> <SMILES>
O[C@@H]1CC2=C(O[C@@H]1C1=CC=C(O)C(O)=C1)C([C@@H]1C[C@H](OC3=CC(O)=CC=C13)C1=CC=C(O)C(O)=C1)=C(O)C=C2O

> <INCHI_IDENTIFIER>
InChI=1S/C30H26O10/c31-15-3-4-16-17(11-26(39-27(16)9-15)13-1-5-19(32)22(35)7-13)28-24(37)12-21(34)18-10-25(38)29(40-30(18)28)14-2-6-20(33)23(36)8-14/h1-9,12,17,25-26,29,31-38H,10-11H2/t17-,25-,26+,29-/m1/s1

> <INCHI_KEY>
PDKAXERKXHATQT-ZMVYIXPCSA-N

> <FORMULA>
C30H26O10

> <MOLECULAR_WEIGHT>
546.528

> <EXACT_MASS>
546.152597037

> <JCHEM_ACCEPTOR_COUNT>
10

> <JCHEM_ATOM_COUNT>
66

> <JCHEM_AVERAGE_POLARIZABILITY>
54.27308822703263

> <JCHEM_BIOAVAILABILITY>
0

> <JCHEM_DONOR_COUNT>
8

> <JCHEM_FORMAL_CHARGE>
0

> <JCHEM_GHOSE_FILTER>
0

> <JCHEM_IUPAC>
(2R,3R)-2-(3,4-dihydroxyphenyl)-8-[(2S,4R)-2-(3,4-dihydroxyphenyl)-7-hydroxy-3,4-dihydro-2H-1-benzopyran-4-yl]-3,4-dihydro-2H-1-benzopyran-3,5,7-triol

> <ALOGPS_LOGP>
2.92

> <JCHEM_LOGP>
4.416260212333333

> <ALOGPS_LOGS>
-4.60

> <JCHEM_MDDR_LIKE_RULE>
0

> <JCHEM_NUMBER_OF_RINGS>
6

> <JCHEM_PHYSIOLOGICAL_CHARGE>
0

> <JCHEM_PKA>
9.21731105590156

> <JCHEM_PKA_STRONGEST_ACIDIC>
8.763504071584375

> <JCHEM_PKA_STRONGEST_BASIC>
-3.289721109744489

> <JCHEM_POLAR_SURFACE_AREA>
180.29999999999998

> <JCHEM_REFRACTIVITY>
143.24259999999998

> <JCHEM_ROTATABLE_BOND_COUNT>
3

> <JCHEM_RULE_OF_FIVE>
0

> <ALOGPS_SOLUBILITY>
1.39e-02 g/l

> <JCHEM_TRADITIONAL_IUPAC>
(2R,3R)-2-(3,4-dihydroxyphenyl)-8-[(2S,4R)-2-(3,4-dihydroxyphenyl)-7-hydroxy-3,4-dihydro-2H-1-benzopyran-4-yl]-3,4-dihydro-2H-1-benzopyran-3,5,7-triol

> <JCHEM_VEBER_RULE>
0

$$$$

HEADER    PROTEIN                                 03-SEP-22   NONE
TITLE     NULL                                                        
COMPND    NULL                                                        
SOURCE    NULL                                                        
KEYWDS    NULL                                                        
EXPDTA    NULL                                                        
AUTHOR    Marvin                                                      
REVDAT   1   03-SEP-22         0                                  
HETATM    1  O   UNK     0      -5.335   4.620   0.000  0.00  0.00           O+0
HETATM    2  C   UNK     0      -4.001   3.850   0.000  0.00  0.00           C+0
HETATM    3  C   UNK     0      -4.001   2.310   0.000  0.00  0.00           C+0
HETATM    4  C   UNK     0      -2.667   1.540   0.000  0.00  0.00           C+0
HETATM    5  C   UNK     0      -1.334   2.310   0.000  0.00  0.00           C+0
HETATM    6  C   UNK     0      -1.334   3.850   0.000  0.00  0.00           C+0
HETATM    7  C   UNK     0      -2.667   4.620   0.000  0.00  0.00           C+0
HETATM    8  O   UNK     0       0.000   4.620   0.000  0.00  0.00           O+0
HETATM    9  C   UNK     0       1.334   3.850   0.000  0.00  0.00           C+0
HETATM   10  C   UNK     0       2.667   4.620   0.000  0.00  0.00           C+0
HETATM   11  C   UNK     0       2.667   6.160   0.000  0.00  0.00           C+0
HETATM   12  C   UNK     0       4.001   6.930   0.000  0.00  0.00           C+0
HETATM   13  C   UNK     0       5.335   6.160   0.000  0.00  0.00           C+0
HETATM   14  O   UNK     0       6.668   6.930   0.000  0.00  0.00           O+0
HETATM   15  C   UNK     0       5.335   4.620   0.000  0.00  0.00           C+0
HETATM   16  O   UNK     0       6.668   3.850   0.000  0.00  0.00           O+0
HETATM   17  C   UNK     0       4.001   3.850   0.000  0.00  0.00           C+0
HETATM   18  C   UNK     0       1.334   2.310   0.000  0.00  0.00           C+0
HETATM   19  C   UNK     0       0.000   1.540   0.000  0.00  0.00           C+0
HETATM   20  C   UNK     0       0.000  -0.000   0.000  0.00  0.00           C+0
HETATM   21  C   UNK     0      -1.334  -0.770   0.000  0.00  0.00           C+0
HETATM   22  O   UNK     0      -2.667  -0.000   0.000  0.00  0.00           O+0
HETATM   23  C   UNK     0      -1.334  -2.310   0.000  0.00  0.00           C+0
HETATM   24  C   UNK     0       0.000  -3.080   0.000  0.00  0.00           C+0
HETATM   25  O   UNK     0       0.000  -4.620   0.000  0.00  0.00           O+0
HETATM   26  C   UNK     0       1.334  -2.310   0.000  0.00  0.00           C+0
HETATM   27  C   UNK     0       1.334  -0.770   0.000  0.00  0.00           C+0
HETATM   28  O   UNK     0       2.667  -0.000   0.000  0.00  0.00           O+0
HETATM   29  C   UNK     0       4.001  -0.770   0.000  0.00  0.00           C+0
HETATM   30  C   UNK     0       5.335  -0.000   0.000  0.00  0.00           C+0
HETATM   31  C   UNK     0       5.335   1.540   0.000  0.00  0.00           C+0
HETATM   32  C   UNK     0       6.668   2.310   0.000  0.00  0.00           C+0
HETATM   33  C   UNK     0       8.002   1.540   0.000  0.00  0.00           C+0
HETATM   34  O   UNK     0       9.336   2.310   0.000  0.00  0.00           O+0
HETATM   35  C   UNK     0       8.002  -0.000   0.000  0.00  0.00           C+0
HETATM   36  O   UNK     0       9.336  -0.770   0.000  0.00  0.00           O+0
HETATM   37  C   UNK     0       6.668  -0.770   0.000  0.00  0.00           C+0
HETATM   38  C   UNK     0       4.001  -2.310   0.000  0.00  0.00           C+0
HETATM   39  O   UNK     0       5.335  -3.080   0.000  0.00  0.00           O+0
HETATM   40  C   UNK     0       2.667  -3.080   0.000  0.00  0.00           C+0
CONECT    1    2                                                            
CONECT    2    1    3    7                                                  
CONECT    3    2    4                                                       
CONECT    4    3    5                                                       
CONECT    5    4    6   19                                                  
CONECT    6    5    7    8                                                  
CONECT    7    6    2                                                       
CONECT    8    6    9                                                       
CONECT    9    8   10   18                                                  
CONECT   10    9   11   17                                                  
CONECT   11   10   12                                                       
CONECT   12   11   13                                                       
CONECT   13   12   14   15                                                  
CONECT   14   13                                                            
CONECT   15   13   16   17                                                  
CONECT   16   15                                                            
CONECT   17   15   10                                                       
CONECT   18    9   19                                                       
CONECT   19   18    5   20                                                  
CONECT   20   19   21   27                                                  
CONECT   21   20   22   23                                                  
CONECT   22   21                                                            
CONECT   23   21   24                                                       
CONECT   24   23   25   26                                                  
CONECT   25   24                                                            
CONECT   26   24   27   40                                                  
CONECT   27   26   20   28                                                  
CONECT   28   27   29                                                       
CONECT   29   28   30   38                                                  
CONECT   30   29   31   37                                                  
CONECT   31   30   32                                                       
CONECT   32   31   33                                                       
CONECT   33   32   34   35                                                  
CONECT   34   33                                                            
CONECT   35   33   36   37                                                  
CONECT   36   35                                                            
CONECT   37   35   30                                                       
CONECT   38   29   39   40                                                  
CONECT   39   38                                                            
CONECT   40   38   26                                                       
MASTER        0    0    0    0    0    0    0    0   40    0   90    0
END

View in JSmol

Synonyms

Value	Source
2a,2'a-Bis(3,4-dihydroxyphenyl)-3,3',4,4'-tetrahydro-4b,8'-bi[2H-1-benzopyran]-3'a,5',7,7'-tetrol	Generator
2Α,2'α-bis(3,4-dihydroxyphenyl)-3,3',4,4'-tetrahydro-4β,8'-bi[2H-1-benzopyran]-3'α,5',7,7'-tetrol	Generator

Chemical Formula

C₃₀H₂₆O₁₀

Average Mass

546.5280 Da

Monoisotopic Mass

546.15260 Da

IUPAC Name

(2R,3R)-2-(3,4-dihydroxyphenyl)-8-[(2S,4R)-2-(3,4-dihydroxyphenyl)-7-hydroxy-3,4-dihydro-2H-1-benzopyran-4-yl]-3,4-dihydro-2H-1-benzopyran-3,5,7-triol

Traditional Name

(2R,3R)-2-(3,4-dihydroxyphenyl)-8-[(2S,4R)-2-(3,4-dihydroxyphenyl)-7-hydroxy-3,4-dihydro-2H-1-benzopyran-4-yl]-3,4-dihydro-2H-1-benzopyran-3,5,7-triol

CAS Registry Number

Not Available

SMILES

O[C@@H]1CC2=C(O[C@@H]1C1=CC=C(O)C(O)=C1)C([C@@H]1C[C@H](OC3=CC(O)=CC=C13)C1=CC=C(O)C(O)=C1)=C(O)C=C2O

InChI Identifier

InChI=1S/C30H26O10/c31-15-3-4-16-17(11-26(39-27(16)9-15)13-1-5-19(32)22(35)7-13)28-24(37)12-21(34)18-10-25(38)29(40-30(18)28)14-2-6-20(33)23(36)8-14/h1-9,12,17,25-26,29,31-38H,10-11H2/t17-,25-,26+,29-/m1/s1

InChI Key

PDKAXERKXHATQT-ZMVYIXPCSA-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
Senna petersiana	LOTUS Database	35616633

Chemical Taxonomy

Description

Belongs to the class of organic compounds known as biflavonoids and polyflavonoids. These are organic compounds containing at least two flavan/flavone units. These units are usually linked through CC or C-O-C bonds. Some examples include C2-O-C3, C2-O-C4, C3'-C3''', and C6-C8''.

Kingdom

Organic compounds

Super Class

Phenylpropanoids and polyketides

Class

Flavonoids

Sub Class

Biflavonoids and polyflavonoids

Direct Parent

Biflavonoids and polyflavonoids

Alternative Parents

Substituents

Bi- and polyflavonoid skeleton
Catechin
3'-hydroxyflavonoid
3-hydroxyflavonoid
4'-hydroxyflavonoid
5-hydroxyflavonoid
7-hydroxyflavonoid
Flavan-3-ol
Hydroxyflavonoid
Flavan
Chromane
Benzopyran
1-benzopyran
Catechol
Phenol
Alkyl aryl ether
1-hydroxy-4-unsubstituted benzenoid
1-hydroxy-2-unsubstituted benzenoid
Monocyclic benzene moiety
Benzenoid
Secondary alcohol
Ether
Oxacycle
Polyol
Organoheterocyclic compound
Organic oxygen compound
Alcohol
Hydrocarbon derivative
Organooxygen compound
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	2.92	ALOGPS
logP	4.42	ChemAxon
logS	-4.6	ALOGPS
pKa (Strongest Acidic)	8.76	ChemAxon
pKa (Strongest Basic)	-3.3	ChemAxon
Physiological Charge	0	ChemAxon
Hydrogen Acceptor Count	10	ChemAxon
Hydrogen Donor Count	8	ChemAxon
Polar Surface Area	180.3 Å²	ChemAxon
Rotatable Bond Count	3	ChemAxon
Refractivity	143.24 m³·mol⁻¹	ChemAxon
Polarizability	54.27 Å³	ChemAxon
Number of Rings	6	ChemAxon
Bioavailability	No	ChemAxon
Rule of Five	No	ChemAxon
Ghose Filter	No	ChemAxon
Veber's Rule	No	ChemAxon
MDDR-like Rule	No	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

100945224

PDB ID

Not Available

ChEBI ID

Not Available

Good Scents ID

Not Available

References

General References

LOTUS database [Link]

Showing NP-Card for (2r,3r)-2-(3,4-dihydroxyphenyl)-8-[(2s,4r)-2-(3,4-dihydroxyphenyl)-7-hydroxy-3,4-dihydro-2h-1-benzopyran-4-yl]-3,4-dihydro-2h-1-benzopyran-3,5,7-triol (NP0173577)

MOL for NP0173577 ((2r,3r)-2-(3,4-dihydroxyphenyl)-8-[(2s,4r)-2-(3,4-dihydroxyphenyl)-7-hydroxy-3,4-dihydro-2h-1-benzopyran-4-yl]-3,4-dihydro-2h-1-benzopyran-3,5,7-triol)

3D MOL for NP0173577 ((2r,3r)-2-(3,4-dihydroxyphenyl)-8-[(2s,4r)-2-(3,4-dihydroxyphenyl)-7-hydroxy-3,4-dihydro-2h-1-benzopyran-4-yl]-3,4-dihydro-2h-1-benzopyran-3,5,7-triol)

3D SDF for NP0173577 ((2r,3r)-2-(3,4-dihydroxyphenyl)-8-[(2s,4r)-2-(3,4-dihydroxyphenyl)-7-hydroxy-3,4-dihydro-2h-1-benzopyran-4-yl]-3,4-dihydro-2h-1-benzopyran-3,5,7-triol)

3D-SDF for NP0173577 ((2r,3r)-2-(3,4-dihydroxyphenyl)-8-[(2s,4r)-2-(3,4-dihydroxyphenyl)-7-hydroxy-3,4-dihydro-2h-1-benzopyran-4-yl]-3,4-dihydro-2h-1-benzopyran-3,5,7-triol)

PDB for NP0173577 ((2r,3r)-2-(3,4-dihydroxyphenyl)-8-[(2s,4r)-2-(3,4-dihydroxyphenyl)-7-hydroxy-3,4-dihydro-2h-1-benzopyran-4-yl]-3,4-dihydro-2h-1-benzopyran-3,5,7-triol)

3D PDB for NP0173577 ((2r,3r)-2-(3,4-dihydroxyphenyl)-8-[(2s,4r)-2-(3,4-dihydroxyphenyl)-7-hydroxy-3,4-dihydro-2h-1-benzopyran-4-yl]-3,4-dihydro-2h-1-benzopyran-3,5,7-triol)

SMILES for NP0173577 ((2r,3r)-2-(3,4-dihydroxyphenyl)-8-[(2s,4r)-2-(3,4-dihydroxyphenyl)-7-hydroxy-3,4-dihydro-2h-1-benzopyran-4-yl]-3,4-dihydro-2h-1-benzopyran-3,5,7-triol)

INCHI for NP0173577 ((2r,3r)-2-(3,4-dihydroxyphenyl)-8-[(2s,4r)-2-(3,4-dihydroxyphenyl)-7-hydroxy-3,4-dihydro-2h-1-benzopyran-4-yl]-3,4-dihydro-2h-1-benzopyran-3,5,7-triol)

Structure for NP0173577 ((2r,3r)-2-(3,4-dihydroxyphenyl)-8-[(2s,4r)-2-(3,4-dihydroxyphenyl)-7-hydroxy-3,4-dihydro-2h-1-benzopyran-4-yl]-3,4-dihydro-2h-1-benzopyran-3,5,7-triol)

3D Structure for NP0173577 ((2r,3r)-2-(3,4-dihydroxyphenyl)-8-[(2s,4r)-2-(3,4-dihydroxyphenyl)-7-hydroxy-3,4-dihydro-2h-1-benzopyran-4-yl]-3,4-dihydro-2h-1-benzopyran-3,5,7-triol)