NP-MRD: Showing NP-Card for 7,2',4',5'-Tetramethoxyflavone (NP0052450)

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Record Information

Version

2.0

Created at

2022-04-27 23:29:23 UTC

Updated at

2022-04-27 23:29:23 UTC

NP-MRD ID

NP0052450

Secondary Accession Numbers

None

Natural Product Identification

Common Name

7,2',4',5'-Tetramethoxyflavone

Description

7,2',4',5'-Tetramethoxyflavone belongs to the class of organic compounds known as 7-o-methylated flavonoids. These are flavonoids with methoxy groups attached to the C7 atom of the flavonoid backbone. Thus, 7,2',4',5'-tetramethoxyflavone is considered to be a flavonoid lipid molecule. 7,2',4',5'-Tetramethoxyflavone is found in Calliandra californica. 7,2',4',5'-Tetramethoxyflavone is a very hydrophobic molecule, practically insoluble (in water), and relatively neutral.

Structure

MOL 3D MOL SDF PDB SMILES InChI

     RDKit          3D

 43 45  0  0  0  0  0  0  0  0999 V2000
    6.6930   -2.1229    1.0709 C   0  0  0  0  0  0  0  0  0  0  0  0
    5.2900   -2.2703    1.1140 O   0  0  0  0  0  0  0  0  0  0  0  0
    4.5255   -1.1907    0.6262 C   0  0  0  0  0  0  0  0  0  0  0  0
    5.1277   -0.0582    0.1364 C   0  0  0  0  0  0  0  0  0  0  0  0
    4.3675    0.9855   -0.3355 C   0  0  0  0  0  0  0  0  0  0  0  0
    2.9717    0.9124   -0.3251 C   0  0  0  0  0  0  0  0  0  0  0  0
    2.1911    1.9360   -0.7884 C   0  0  0  0  0  0  0  0  0  0  0  0
    2.7275    2.9738   -1.2375 O   0  0  0  0  0  0  0  0  0  0  0  0
    0.7936    1.8284   -0.7629 C   0  0  0  0  0  0  0  0  0  0  0  0
    0.2484    0.6742   -0.2626 C   0  0  0  0  0  0  0  0  0  0  0  0
   -1.1898    0.4044   -0.1662 C   0  0  0  0  0  0  0  0  0  0  0  0
   -1.5690   -0.8324    0.3725 C   0  0  0  0  0  0  0  0  0  0  0  0
   -2.8911   -1.1730    0.5019 C   0  0  0  0  0  0  0  0  0  0  0  0
   -3.2749   -2.4140    1.0424 O   0  0  0  0  0  0  0  0  0  0  0  0
   -2.2453   -3.3058    1.4511 C   0  0  0  0  0  0  0  0  0  0  0  0
   -3.8478   -0.2719    0.0903 C   0  0  0  0  0  0  0  0  0  0  0  0
   -5.1848   -0.6495    0.2357 O   0  0  0  0  0  0  0  0  0  0  0  0
   -6.1909    0.2439   -0.1733 C   0  0  0  0  0  0  0  0  0  0  0  0
   -3.5215    0.9470   -0.4414 C   0  0  0  0  0  0  0  0  0  0  0  0
   -2.1640    1.2799   -0.5668 C   0  0  0  0  0  0  0  0  0  0  0  0
   -1.8527    2.5038   -1.1009 O   0  0  0  0  0  0  0  0  0  0  0  0
   -2.8605    3.3864   -1.5052 C   0  0  0  0  0  0  0  0  0  0  0  0
    1.0645   -0.2748    0.1684 O   0  0  0  0  0  0  0  0  0  0  0  0
    2.3605   -0.2223    0.1656 C   0  0  0  0  0  0  0  0  0  0  0  0
    3.1523   -1.2505    0.6311 C   0  0  0  0  0  0  0  0  0  0  0  0
    7.0538   -1.8986    0.0479 H   0  0  0  0  0  0  0  0  0  0  0  0
    7.1382   -3.0589    1.4874 H   0  0  0  0  0  0  0  0  0  0  0  0
    6.9394   -1.2907    1.7799 H   0  0  0  0  0  0  0  0  0  0  0  0
    6.2024   -0.0037    0.1292 H   0  0  0  0  0  0  0  0  0  0  0  0
    4.8322    1.8803   -0.7227 H   0  0  0  0  0  0  0  0  0  0  0  0
    0.2029    2.6254   -1.1234 H   0  0  0  0  0  0  0  0  0  0  0  0
   -0.8095   -1.5556    0.7028 H   0  0  0  0  0  0  0  0  0  0  0  0
   -1.5239   -2.8126    2.1419 H   0  0  0  0  0  0  0  0  0  0  0  0
   -1.6852   -3.5988    0.5517 H   0  0  0  0  0  0  0  0  0  0  0  0
   -2.6724   -4.2225    1.8866 H   0  0  0  0  0  0  0  0  0  0  0  0
   -5.9914    0.4752   -1.2509 H   0  0  0  0  0  0  0  0  0  0  0  0
   -6.1224    1.2243    0.3605 H   0  0  0  0  0  0  0  0  0  0  0  0
   -7.1909   -0.1828   -0.0451 H   0  0  0  0  0  0  0  0  0  0  0  0
   -4.2936    1.6488   -0.7624 H   0  0  0  0  0  0  0  0  0  0  0  0
   -3.4505    2.9465   -2.3389 H   0  0  0  0  0  0  0  0  0  0  0  0
   -2.4483    4.3692   -1.8279 H   0  0  0  0  0  0  0  0  0  0  0  0
   -3.5549    3.5462   -0.6414 H   0  0  0  0  0  0  0  0  0  0  0  0
    2.6528   -2.1314    1.0116 H   0  0  0  0  0  0  0  0  0  0  0  0
  1  2  1  0
  2  3  1  0
  3  4  2  0
  4  5  1  0
  5  6  2  0
  6  7  1  0
  7  8  2  0
  7  9  1  0
  9 10  2  0
 10 23  1  0
 23 24  1  0
 24 25  2  0
 10 11  1  0
 11 12  2  0
 12 13  1  0
 13 14  1  0
 14 15  1  0
 13 16  2  0
 16 17  1  0
 17 18  1  0
 16 19  1  0
 19 20  2  0
 20 21  1  0
 21 22  1  0
 25  3  1  0
 20 11  1  0
 24  6  1  0
  1 26  1  0
  1 27  1  0
  1 28  1  0
  4 29  1  0
  5 30  1  0
  9 31  1  0
 25 43  1  0
 12 32  1  0
 15 33  1  0
 15 34  1  0
 15 35  1  0
 18 36  1  0
 18 37  1  0
 18 38  1  0
 19 39  1  0
 22 40  1  0
 22 41  1  0
 22 42  1  0
M  END

  Mrv1533004171520462D          

 25 27  0  0  0  0            999 V2000
   -0.7145   -1.2375    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    0.0000   -1.6500    0.0000 O   0  0  0  0  0  0  0  0  0  0  0  0
    0.7145   -1.2375    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    0.7145   -0.4125    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    1.4289    0.0000    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    2.1434   -0.4125    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    2.8579    0.0000    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    2.8579    0.8250    0.0000 O   0  0  0  0  0  0  0  0  0  0  0  0
    3.5724   -0.4125    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    3.5724   -1.2375    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    2.8579   -1.6500    0.0000 O   0  0  0  0  0  0  0  0  0  0  0  0
    2.1434   -1.2375    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    1.4289   -1.6500    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    4.2868   -1.6500    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    5.0013   -1.2375    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    5.7158   -1.6500    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    6.4302   -1.2375    0.0000 O   0  0  0  0  0  0  0  0  0  0  0  0
    7.1447   -1.6500    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    5.7158   -2.4750    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    6.4302   -2.8875    0.0000 O   0  0  0  0  0  0  0  0  0  0  0  0
    7.1447   -2.4750    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    5.0013   -2.8875    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    4.2868   -2.4750    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    3.5724   -2.8875    0.0000 O   0  0  0  0  0  0  0  0  0  0  0  0
    2.8579   -2.4750    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
  1  2  1  0  0  0  0
  2  3  1  0  0  0  0
  3  4  2  0  0  0  0
  4  5  1  0  0  0  0
  5  6  2  0  0  0  0
  6  7  1  0  0  0  0
  7  8  2  0  0  0  0
  7  9  1  0  0  0  0
  9 10  2  0  0  0  0
 10 11  1  0  0  0  0
 11 12  1  0  0  0  0
  6 12  1  0  0  0  0
 12 13  2  0  0  0  0
  3 13  1  0  0  0  0
 10 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
 17 18  1  0  0  0  0
 16 19  2  0  0  0  0
 19 20  1  0  0  0  0
 20 21  1  0  0  0  0
 19 22  1  0  0  0  0
 22 23  2  0  0  0  0
 14 23  1  0  0  0  0
 23 24  1  0  0  0  0
 24 25  1  0  0  0  0
M  END
> <DATABASE_ID>
NP0052450

> <DATABASE_NAME>
NP-MRD

> <SMILES>
COC1=CC=C2C(=O)C=C(OC2=C1)C1=CC(OC)=C(OC)C=C1OC

> <INCHI_IDENTIFIER>
InChI=1S/C19H18O6/c1-21-11-5-6-12-14(20)9-17(25-16(12)7-11)13-8-18(23-3)19(24-4)10-15(13)22-2/h5-10H,1-4H3

> <INCHI_KEY>
WNAGNQBPWYEERY-UHFFFAOYSA-N

> <FORMULA>
C19H18O6

> <MOLECULAR_WEIGHT>
342.347

> <EXACT_MASS>
342.1103383

> <JCHEM_ACCEPTOR_COUNT>
6

> <JCHEM_ATOM_COUNT>
43

> <JCHEM_AVERAGE_POLARIZABILITY>
35.795866588968885

> <JCHEM_BIOAVAILABILITY>
1

> <JCHEM_DONOR_COUNT>
0

> <JCHEM_FORMAL_CHARGE>
0

> <JCHEM_GHOSE_FILTER>
1

> <JCHEM_IUPAC>
7-methoxy-2-(2,4,5-trimethoxyphenyl)-4H-chromen-4-one

> <ALOGPS_LOGP>
3.23

> <JCHEM_LOGP>
2.3367000360000003

> <ALOGPS_LOGS>
-4.55

> <JCHEM_MDDR_LIKE_RULE>
0

> <JCHEM_NUMBER_OF_RINGS>
3

> <JCHEM_PHYSIOLOGICAL_CHARGE>
0

> <JCHEM_PKA_STRONGEST_ACIDIC>
15.34829324445358

> <JCHEM_PKA_STRONGEST_BASIC>
-4.241036657967449

> <JCHEM_POLAR_SURFACE_AREA>
63.22000000000001

> <JCHEM_REFRACTIVITY>
92.82400000000001

> <JCHEM_ROTATABLE_BOND_COUNT>
5

> <JCHEM_RULE_OF_FIVE>
1

> <ALOGPS_SOLUBILITY>
9.65e-03 g/l

> <JCHEM_TRADITIONAL_IUPAC>
7-methoxy-2-(2,4,5-trimethoxyphenyl)chromen-4-one

> <JCHEM_VEBER_RULE>
0

$$$$

HEADER    PROTEIN                                 17-APR-15   NONE
TITLE     NULL                                                        
COMPND    NULL                                                        
SOURCE    NULL                                                        
KEYWDS    NULL                                                        
EXPDTA    NULL                                                        
AUTHOR    Marvin                                                      
REVDAT   1   17-APR-15         0                                  
HETATM    1  C   UNK     0      -1.334  -2.310   0.000  0.00  0.00           C+0
HETATM    2  O   UNK     0       0.000  -3.080   0.000  0.00  0.00           O+0
HETATM    3  C   UNK     0       1.334  -2.310   0.000  0.00  0.00           C+0
HETATM    4  C   UNK     0       1.334  -0.770   0.000  0.00  0.00           C+0
HETATM    5  C   UNK     0       2.667   0.000   0.000  0.00  0.00           C+0
HETATM    6  C   UNK     0       4.001  -0.770   0.000  0.00  0.00           C+0
HETATM    7  C   UNK     0       5.335   0.000   0.000  0.00  0.00           C+0
HETATM    8  O   UNK     0       5.335   1.540   0.000  0.00  0.00           O+0
HETATM    9  C   UNK     0       6.668  -0.770   0.000  0.00  0.00           C+0
HETATM   10  C   UNK     0       6.668  -2.310   0.000  0.00  0.00           C+0
HETATM   11  O   UNK     0       5.335  -3.080   0.000  0.00  0.00           O+0
HETATM   12  C   UNK     0       4.001  -2.310   0.000  0.00  0.00           C+0
HETATM   13  C   UNK     0       2.667  -3.080   0.000  0.00  0.00           C+0
HETATM   14  C   UNK     0       8.002  -3.080   0.000  0.00  0.00           C+0
HETATM   15  C   UNK     0       9.336  -2.310   0.000  0.00  0.00           C+0
HETATM   16  C   UNK     0      10.669  -3.080   0.000  0.00  0.00           C+0
HETATM   17  O   UNK     0      12.003  -2.310   0.000  0.00  0.00           O+0
HETATM   18  C   UNK     0      13.337  -3.080   0.000  0.00  0.00           C+0
HETATM   19  C   UNK     0      10.669  -4.620   0.000  0.00  0.00           C+0
HETATM   20  O   UNK     0      12.003  -5.390   0.000  0.00  0.00           O+0
HETATM   21  C   UNK     0      13.337  -4.620   0.000  0.00  0.00           C+0
HETATM   22  C   UNK     0       9.336  -5.390   0.000  0.00  0.00           C+0
HETATM   23  C   UNK     0       8.002  -4.620   0.000  0.00  0.00           C+0
HETATM   24  O   UNK     0       6.668  -5.390   0.000  0.00  0.00           O+0
HETATM   25  C   UNK     0       5.335  -4.620   0.000  0.00  0.00           C+0
CONECT    1    2                                                            
CONECT    2    1    3                                                       
CONECT    3    2    4   13                                                  
CONECT    4    3    5                                                       
CONECT    5    4    6                                                       
CONECT    6    5    7   12                                                  
CONECT    7    6    8    9                                                  
CONECT    8    7                                                            
CONECT    9    7   10                                                       
CONECT   10    9   11   14                                                  
CONECT   11   10   12                                                       
CONECT   12   11    6   13                                                  
CONECT   13   12    3                                                       
CONECT   14   10   15   23                                                  
CONECT   15   14   16                                                       
CONECT   16   15   17   19                                                  
CONECT   17   16   18                                                       
CONECT   18   17                                                            
CONECT   19   16   20   22                                                  
CONECT   20   19   21                                                       
CONECT   21   20                                                            
CONECT   22   19   23                                                       
CONECT   23   22   14   24                                                  
CONECT   24   23   25                                                       
CONECT   25   24                                                            
MASTER        0    0    0    0    0    0    0    0   25    0   54    0
END

View in JSmol

Synonyms

Value	Source
72'4'5'-Tetramethoxyflavone	ChEMBL

Chemical Formula

C₁₉H₁₈O₆

Average Mass

342.3470 Da

Monoisotopic Mass

342.11034 Da

IUPAC Name

7-methoxy-2-(2,4,5-trimethoxyphenyl)-4H-chromen-4-one

Traditional Name

7-methoxy-2-(2,4,5-trimethoxyphenyl)chromen-4-one

CAS Registry Number

Not Available

SMILES

COC1=CC=C2C(=O)C=C(OC2=C1)C1=CC(OC)=C(OC)C=C1OC

InChI Identifier

InChI=1S/C19H18O6/c1-21-11-5-6-12-14(20)9-17(25-16(12)7-11)13-8-18(23-3)19(24-4)10-15(13)22-2/h5-10H,1-4H3

InChI Key

WNAGNQBPWYEERY-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, D₂O, predicted)	Wishart Lab	Wishart Lab	David Wishart	2021-06-20	View Spectrum
1D NMR	¹H NMR Spectrum (1D, 100 MHz, D₂O, predicted)	Wishart Lab	Wishart Lab	David Wishart	2021-06-20	View Spectrum
1D NMR	¹³C NMR Spectrum (1D, 252 MHz, D₂O, predicted)	Wishart Lab	Wishart Lab	David Wishart	2021-06-20	View Spectrum
1D NMR	¹H NMR Spectrum (1D, 1000 MHz, D₂O, predicted)	Wishart Lab	Wishart Lab	David Wishart	2021-06-20	View Spectrum
1D NMR	¹³C NMR Spectrum (1D, 50 MHz, D₂O, predicted)	Wishart Lab	Wishart Lab	David Wishart	2021-06-20	View Spectrum
1D NMR	¹H NMR Spectrum (1D, 200 MHz, D₂O, predicted)	Wishart Lab	Wishart Lab	David Wishart	2021-06-20	View Spectrum
1D NMR	¹³C NMR Spectrum (1D, 75 MHz, D₂O, predicted)	Wishart Lab	Wishart Lab	David Wishart	2021-06-20	View Spectrum
1D NMR	¹H NMR Spectrum (1D, 300 MHz, D₂O, predicted)	Wishart Lab	Wishart Lab	David Wishart	2021-06-20	View Spectrum
1D NMR	¹³C NMR Spectrum (1D, 101 MHz, D₂O, predicted)	Wishart Lab	Wishart Lab	David Wishart	2021-06-20	View Spectrum
1D NMR	¹H NMR Spectrum (1D, 400 MHz, D₂O, predicted)	Wishart Lab	Wishart Lab	David Wishart	2021-06-20	View Spectrum
1D NMR	¹³C NMR Spectrum (1D, 126 MHz, D₂O, predicted)	Wishart Lab	Wishart Lab	David Wishart	2021-06-20	View Spectrum
1D NMR	¹H NMR Spectrum (1D, 500 MHz, D₂O, predicted)	Wishart Lab	Wishart Lab	David Wishart	2021-06-20	View Spectrum
1D NMR	¹³C NMR Spectrum (1D, 151 MHz, D₂O, predicted)	Wishart Lab	Wishart Lab	David Wishart	2021-06-20	View Spectrum
1D NMR	¹H NMR Spectrum (1D, 600 MHz, D₂O, predicted)	Wishart Lab	Wishart Lab	David Wishart	2021-06-20	View Spectrum
1D NMR	¹³C NMR Spectrum (1D, 176 MHz, D₂O, predicted)	Wishart Lab	Wishart Lab	David Wishart	2021-06-20	View Spectrum
1D NMR	¹H NMR Spectrum (1D, 700 MHz, D₂O, predicted)	Wishart Lab	Wishart Lab	David Wishart	2021-06-20	View Spectrum
1D NMR	¹³C NMR Spectrum (1D, 201 MHz, D₂O, predicted)	Wishart Lab	Wishart Lab	David Wishart	2021-06-20	View Spectrum
1D NMR	¹H NMR Spectrum (1D, 800 MHz, D₂O, predicted)	Wishart Lab	Wishart Lab	David Wishart	2021-06-20	View Spectrum
1D NMR	¹³C NMR Spectrum (1D, 226 MHz, D₂O, predicted)	Wishart Lab	Wishart Lab	David Wishart	2021-06-20	View Spectrum
1D NMR	¹H NMR Spectrum (1D, 900 MHz, D₂O, 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
Calliandra californica	Plant	KNApSAcK

Chemical Taxonomy

Description

Belongs to the class of organic compounds known as 7-o-methylated flavonoids. These are flavonoids with methoxy groups attached to the C7 atom of the flavonoid backbone.

Kingdom

Organic compounds

Super Class

Phenylpropanoids and polyketides

Class

Flavonoids

Sub Class

O-methylated flavonoids

Direct Parent

7-O-methylated flavonoids

Alternative Parents

Substituents

2p-methoxyflavonoid-skeleton
3p-methoxyflavonoid-skeleton
4p-methoxyflavonoid-skeleton
7-methoxyflavonoid-skeleton
Flavone
Chromone
Benzopyran
1-benzopyran
Phenoxy compound
Anisole
Methoxybenzene
Phenol ether
Alkyl aryl ether
Pyranone
Monocyclic benzene moiety
Pyran
Benzenoid
Heteroaromatic compound
Ether
Oxacycle
Organoheterocyclic compound
Hydrocarbon derivative
Organooxygen compound
Organic oxide
Organic oxygen compound
Aromatic heteropolycyclic compound

Molecular Framework

Aromatic heteropolycyclic compounds

External Descriptors

Flavones and Flavonols (LMPK12110054 )

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	3.23	ALOGPS
logP	2.34	ChemAxon
logS	-4.6	ALOGPS
pKa (Strongest Acidic)	15.35	ChemAxon
pKa (Strongest Basic)	-4.2	ChemAxon
Physiological Charge	0	ChemAxon
Hydrogen Acceptor Count	6	ChemAxon
Hydrogen Donor Count	0	ChemAxon
Polar Surface Area	63.22 Å²	ChemAxon
Rotatable Bond Count	5	ChemAxon
Refractivity	92.82 m³·mol⁻¹	ChemAxon
Polarizability	35.8 Å³	ChemAxon
Number of Rings	3	ChemAxon
Bioavailability	Yes	ChemAxon
Rule of Five	Yes	ChemAxon
Ghose Filter	Yes	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

9974636

PDB ID

Not Available

ChEBI ID

Not Available

Good Scents ID

Not Available

References

General References

Not Available

Showing NP-Card for 7,2',4',5'-Tetramethoxyflavone (NP0052450)

MOL for NP0052450 (7,2',4',5'-Tetramethoxyflavone)

3D MOL for NP0052450 (7,2',4',5'-Tetramethoxyflavone)

3D SDF for NP0052450 (7,2',4',5'-Tetramethoxyflavone)

3D-SDF for NP0052450 (7,2',4',5'-Tetramethoxyflavone)

PDB for NP0052450 (7,2',4',5'-Tetramethoxyflavone)

3D PDB for NP0052450 (7,2',4',5'-Tetramethoxyflavone)

SMILES for NP0052450 (7,2',4',5'-Tetramethoxyflavone)

INCHI for NP0052450 (7,2',4',5'-Tetramethoxyflavone)

Structure for NP0052450 (7,2',4',5'-Tetramethoxyflavone)

3D Structure for NP0052450 (7,2',4',5'-Tetramethoxyflavone)