NP-MRD: Showing NP-Card for (3r)-5,7-dihydroxy-3-(4-hydroxy-2-methoxyphenyl)-2,3-dihydro-1-benzopyran-4-one (NP0266793)

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Record Information

Version

2.0

Created at

2022-09-08 11:21:48 UTC

Updated at

2022-09-08 11:21:48 UTC

NP-MRD ID

NP0266793

Secondary Accession Numbers

None

Natural Product Identification

Common Name

(3r)-5,7-dihydroxy-3-(4-hydroxy-2-methoxyphenyl)-2,3-dihydro-1-benzopyran-4-one

Description

(3R)-5,7-dihydroxy-3-(4-hydroxy-2-methoxyphenyl)-3,4-dihydro-2H-1-benzopyran-4-one belongs to the class of organic compounds known as 2'-o-methylated isoflavonoids. These are isoflavonoids with methoxy groups attached to the C2' atom of the isoflavonoid backbone. Isoflavonoids are natural products derived from 3-phenylchromen-4-one. (3r)-5,7-dihydroxy-3-(4-hydroxy-2-methoxyphenyl)-2,3-dihydro-1-benzopyran-4-one is found in Uraria picta. Based on a literature review very few articles have been published on (3R)-5,7-dihydroxy-3-(4-hydroxy-2-methoxyphenyl)-3,4-dihydro-2H-1-benzopyran-4-one.

Structure

MOL 3D MOL SDF PDB SMILES InChI

     RDKit          3D

 36 38  0  0  0  0  0  0  0  0999 V2000
   -3.0744    2.6397    1.3398 C   0  0  0  0  0  0  0  0  0  0  0  0
   -2.1708    1.7182    0.7764 O   0  0  0  0  0  0  0  0  0  0  0  0
   -2.5126    0.4405    0.3345 C   0  0  0  0  0  0  0  0  0  0  0  0
   -3.7966   -0.0237    0.4747 C   0  0  0  0  0  0  0  0  0  0  0  0
   -4.1165   -1.3166    0.0028 C   0  0  0  0  0  0  0  0  0  0  0  0
   -5.4393   -1.7863    0.1424 O   0  0  0  0  0  0  0  0  0  0  0  0
   -3.1290   -2.0800   -0.5807 C   0  0  0  0  0  0  0  0  0  0  0  0
   -1.8089   -1.6128   -0.7280 C   0  0  0  0  0  0  0  0  0  0  0  0
   -1.5260   -0.3504   -0.2634 C   0  0  0  0  0  0  0  0  0  0  0  0
   -0.1754    0.2089   -0.2587 C   0  0  2  0  0  0  0  0  0  0  0  0
    0.3582    0.3864   -1.7207 C   0  0  0  0  0  0  0  0  0  0  0  0
    1.4567    1.3175   -1.4949 O   0  0  0  0  0  0  0  0  0  0  0  0
    2.4817    0.7542   -0.7448 C   0  0  0  0  0  0  0  0  0  0  0  0
    3.7931    1.2178   -0.8945 C   0  0  0  0  0  0  0  0  0  0  0  0
    4.8191    0.6638   -0.1671 C   0  0  0  0  0  0  0  0  0  0  0  0
    6.1084    1.1639   -0.3628 O   0  0  0  0  0  0  0  0  0  0  0  0
    4.5772   -0.3436    0.7105 C   0  0  0  0  0  0  0  0  0  0  0  0
    3.2812   -0.8616    0.9174 C   0  0  0  0  0  0  0  0  0  0  0  0
    3.1117   -1.8631    1.8061 O   0  0  0  0  0  0  0  0  0  0  0  0
    2.2221   -0.2858    0.1632 C   0  0  0  0  0  0  0  0  0  0  0  0
    0.8620   -0.7650    0.3230 C   0  0  0  0  0  0  0  0  0  0  0  0
    0.6045   -1.8376    0.8745 O   0  0  0  0  0  0  0  0  0  0  0  0
   -2.4966    3.5199    1.7471 H   0  0  0  0  0  0  0  0  0  0  0  0
   -3.5827    3.1248    0.4104 H   0  0  0  0  0  0  0  0  0  0  0  0
   -3.7958    2.2874    2.0572 H   0  0  0  0  0  0  0  0  0  0  0  0
   -4.5516    0.5310    0.9350 H   0  0  0  0  0  0  0  0  0  0  0  0
   -5.6509   -2.6904   -0.1942 H   0  0  0  0  0  0  0  0  0  0  0  0
   -3.3079   -3.0659   -0.9772 H   0  0  0  0  0  0  0  0  0  0  0  0
   -1.0699   -2.2398   -1.2089 H   0  0  0  0  0  0  0  0  0  0  0  0
   -0.1062    1.1188    0.3085 H   0  0  0  0  0  0  0  0  0  0  0  0
    0.6890   -0.5331   -2.1144 H   0  0  0  0  0  0  0  0  0  0  0  0
   -0.4308    0.8926   -2.3443 H   0  0  0  0  0  0  0  0  0  0  0  0
    3.9395    2.0177   -1.6333 H   0  0  0  0  0  0  0  0  0  0  0  0
    6.7435    0.8199   -1.0527 H   0  0  0  0  0  0  0  0  0  0  0  0
    5.3262   -0.8125    1.3173 H   0  0  0  0  0  0  0  0  0  0  0  0
    2.3681   -2.3551    2.1113 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  1  0
  5  7  2  0
  7  8  1  0
  8  9  2  0
  9 10  1  0
 10 11  1  0
 11 12  1  0
 12 13  1  0
 13 14  2  0
 14 15  1  0
 15 16  1  0
 15 17  2  0
 17 18  1  0
 18 19  1  0
 18 20  2  0
 20 21  1  0
 21 22  2  0
  9  3  1  0
 21 10  1  0
 20 13  1  0
  1 23  1  0
  1 24  1  0
  1 25  1  0
  4 26  1  0
  6 27  1  0
  7 28  1  0
  8 29  1  0
 10 30  1  1
 11 31  1  0
 11 32  1  0
 14 33  1  0
 16 34  1  0
 17 35  1  0
 19 36  1  0
M  END


  Mrv1652309082213212D          

 22 24  0  0  1  0            999 V2000
    0.7145   -3.7125    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    0.7145   -2.8875    0.0000 O   0  0  0  0  0  0  0  0  0  0  0  0
    0.0000   -2.4750    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
   -0.7145   -2.8875    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
   -1.4289   -2.4750    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
   -2.1434   -2.8875    0.0000 O   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
   -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 C   0  0  0  0  0  0  0  0  0  0  0  0
    0.7145   -1.2375    0.0000 C   0  0  2  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 O   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
    3.5724   -0.4125    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    4.2868   -0.0000    0.0000 O   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 C   0  0  0  0  0  0  0  0  0  0  0  0
    2.8579   -2.4750    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
    1.4289   -2.4750    0.0000 O   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  1  0  0  0  0
  5  7  2  0  0  0  0
  7  8  1  0  0  0  0
  8  9  2  0  0  0  0
  3  9  1  0  0  0  0
 10  9  1  6  0  0  0
 10 11  1  0  0  0  0
 11 12  1  0  0  0  0
 12 13  1  0  0  0  0
 13 14  2  0  0  0  0
 14 15  1  0  0  0  0
 15 16  1  0  0  0  0
 15 17  2  0  0  0  0
 17 18  1  0  0  0  0
 18 19  1  0  0  0  0
 18 20  2  0  0  0  0
 13 20  1  0  0  0  0
 20 21  1  0  0  0  0
 10 21  1  0  0  0  0
 21 22  2  0  0  0  0
M  END
> <DATABASE_ID>
NP0266793

> <DATABASE_NAME>
NP-MRD

> <SMILES>
COC1=CC(O)=CC=C1[C@@H]1COC2=CC(O)=CC(O)=C2C1=O

> <INCHI_IDENTIFIER>
InChI=1S/C16H14O6/c1-21-13-5-8(17)2-3-10(13)11-7-22-14-6-9(18)4-12(19)15(14)16(11)20/h2-6,11,17-19H,7H2,1H3/t11-/m0/s1

> <INCHI_KEY>
VODZWHSRITUHNI-NSHDSACASA-N

> <FORMULA>
C16H14O6

> <MOLECULAR_WEIGHT>
302.282

> <EXACT_MASS>
302.079038171

> <JCHEM_ACCEPTOR_COUNT>
6

> <JCHEM_ATOM_COUNT>
36

> <JCHEM_AVERAGE_POLARIZABILITY>
29.910729069771776

> <JCHEM_BIOAVAILABILITY>
1

> <JCHEM_DONOR_COUNT>
3

> <JCHEM_FORMAL_CHARGE>
0

> <JCHEM_GHOSE_FILTER>
1

> <JCHEM_IUPAC>
(3R)-5,7-dihydroxy-3-(4-hydroxy-2-methoxyphenyl)-3,4-dihydro-2H-1-benzopyran-4-one

> <JCHEM_LOGP>
2.5699868483333326

> <JCHEM_MDDR_LIKE_RULE>
0

> <JCHEM_NUMBER_OF_RINGS>
3

> <JCHEM_PHYSIOLOGICAL_CHARGE>
0

> <JCHEM_PKA>
9.177963496989928

> <JCHEM_PKA_STRONGEST_ACIDIC>
7.8396098938844725

> <JCHEM_PKA_STRONGEST_BASIC>
-4.580410233336863

> <JCHEM_POLAR_SURFACE_AREA>
96.22

> <JCHEM_REFRACTIVITY>
78.13969999999998

> <JCHEM_ROTATABLE_BOND_COUNT>
2

> <JCHEM_RULE_OF_FIVE>
1

> <JCHEM_TRADITIONAL_IUPAC>
(3R)-5,7-dihydroxy-3-(4-hydroxy-2-methoxyphenyl)-2,3-dihydro-1-benzopyran-4-one

> <JCHEM_VEBER_RULE>
0

$$$$

HEADER    PROTEIN                                 08-SEP-22   NONE
TITLE     NULL                                                        
COMPND    NULL                                                        
SOURCE    NULL                                                        
KEYWDS    NULL                                                        
EXPDTA    NULL                                                        
AUTHOR    Marvin                                                      
REVDAT   1   08-SEP-22         0                                  
HETATM    1  C   UNK     0       1.334  -6.930   0.000  0.00  0.00           C+0
HETATM    2  O   UNK     0       1.334  -5.390   0.000  0.00  0.00           O+0
HETATM    3  C   UNK     0       0.000  -4.620   0.000  0.00  0.00           C+0
HETATM    4  C   UNK     0      -1.334  -5.390   0.000  0.00  0.00           C+0
HETATM    5  C   UNK     0      -2.667  -4.620   0.000  0.00  0.00           C+0
HETATM    6  O   UNK     0      -4.001  -5.390   0.000  0.00  0.00           O+0
HETATM    7  C   UNK     0      -2.667  -3.080   0.000  0.00  0.00           C+0
HETATM    8  C   UNK     0      -1.334  -2.310   0.000  0.00  0.00           C+0
HETATM    9  C   UNK     0       0.000  -3.080   0.000  0.00  0.00           C+0
HETATM   10  C   UNK     0       1.334  -2.310   0.000  0.00  0.00           C+0
HETATM   11  C   UNK     0       1.334  -0.770   0.000  0.00  0.00           C+0
HETATM   12  O   UNK     0       2.667   0.000   0.000  0.00  0.00           O+0
HETATM   13  C   UNK     0       4.001  -0.770   0.000  0.00  0.00           C+0
HETATM   14  C   UNK     0       5.335   0.000   0.000  0.00  0.00           C+0
HETATM   15  C   UNK     0       6.668  -0.770   0.000  0.00  0.00           C+0
HETATM   16  O   UNK     0       8.002  -0.000   0.000  0.00  0.00           O+0
HETATM   17  C   UNK     0       6.668  -2.310   0.000  0.00  0.00           C+0
HETATM   18  C   UNK     0       5.335  -3.080   0.000  0.00  0.00           C+0
HETATM   19  O   UNK     0       5.335  -4.620   0.000  0.00  0.00           O+0
HETATM   20  C   UNK     0       4.001  -2.310   0.000  0.00  0.00           C+0
HETATM   21  C   UNK     0       2.667  -3.080   0.000  0.00  0.00           C+0
HETATM   22  O   UNK     0       2.667  -4.620   0.000  0.00  0.00           O+0
CONECT    1    2                                                            
CONECT    2    1    3                                                       
CONECT    3    2    4    9                                                  
CONECT    4    3    5                                                       
CONECT    5    4    6    7                                                  
CONECT    6    5                                                            
CONECT    7    5    8                                                       
CONECT    8    7    9                                                       
CONECT    9    8    3   10                                                  
CONECT   10    9   11   21                                                  
CONECT   11   10   12                                                       
CONECT   12   11   13                                                       
CONECT   13   12   14   20                                                  
CONECT   14   13   15                                                       
CONECT   15   14   16   17                                                  
CONECT   16   15                                                            
CONECT   17   15   18                                                       
CONECT   18   17   19   20                                                  
CONECT   19   18                                                            
CONECT   20   18   13   21                                                  
CONECT   21   20   10   22                                                  
CONECT   22   21                                                            
MASTER        0    0    0    0    0    0    0    0   22    0   48    0
END

View in JSmol

Synonyms

Not Available

Chemical Formula

C₁₆H₁₄O₆

Average Mass

302.2820 Da

Monoisotopic Mass

302.07904 Da

IUPAC Name

(3R)-5,7-dihydroxy-3-(4-hydroxy-2-methoxyphenyl)-3,4-dihydro-2H-1-benzopyran-4-one

Traditional Name

(3R)-5,7-dihydroxy-3-(4-hydroxy-2-methoxyphenyl)-2,3-dihydro-1-benzopyran-4-one

CAS Registry Number

Not Available

SMILES

COC1=CC(O)=CC=C1[C@@H]1COC2=CC(O)=CC(O)=C2C1=O

InChI Identifier

InChI=1S/C16H14O6/c1-21-13-5-8(17)2-3-10(13)11-7-22-14-6-9(18)4-12(19)15(14)16(11)20/h2-6,11,17-19H,7H2,1H3/t11-/m0/s1

InChI Key

VODZWHSRITUHNI-NSHDSACASA-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
Uraria picta	LOTUS Database	35616633

Chemical Taxonomy

Description

Belongs to the class of organic compounds known as 2'-o-methylated isoflavonoids. These are isoflavonoids with methoxy groups attached to the C2' atom of the isoflavonoid backbone. Isoflavonoids are natural products derived from 3-phenylchromen-4-one.

Kingdom

Organic compounds

Super Class

Phenylpropanoids and polyketides

Class

Isoflavonoids

Sub Class

O-methylated isoflavonoids

Direct Parent

2'-O-methylated isoflavonoids

Alternative Parents

Substituents

2p-methoxyisoflavonoid-skeleton
Hydroxyisoflavonoid
Isoflavanone
Isoflavanol
Isoflavan
Chromone
1-benzopyran
Methoxyphenol
Benzopyran
Chromane
Phenoxy compound
Methoxybenzene
Aryl alkyl ketone
Aryl ketone
Phenol ether
Anisole
1-hydroxy-4-unsubstituted benzenoid
1-hydroxy-2-unsubstituted benzenoid
Phenol
Alkyl aryl ether
Benzenoid
Monocyclic benzene moiety
Vinylogous acid
Ketone
Oxacycle
Organoheterocyclic compound
Ether
Organic oxygen compound
Organic oxide
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	2.57	ChemAxon
pKa (Strongest Acidic)	7.84	ChemAxon
pKa (Strongest Basic)	-4.6	ChemAxon
Physiological Charge	0	ChemAxon
Hydrogen Acceptor Count	6	ChemAxon
Hydrogen Donor Count	3	ChemAxon
Polar Surface Area	96.22 Å²	ChemAxon
Rotatable Bond Count	2	ChemAxon
Refractivity	78.14 m³·mol⁻¹	ChemAxon
Polarizability	29.91 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

162993234

PDB ID

Not Available

ChEBI ID

Not Available

Good Scents ID

Not Available

References

General References

LOTUS database [Link]

Showing NP-Card for (3r)-5,7-dihydroxy-3-(4-hydroxy-2-methoxyphenyl)-2,3-dihydro-1-benzopyran-4-one (NP0266793)

MOL for NP0266793 ((3r)-5,7-dihydroxy-3-(4-hydroxy-2-methoxyphenyl)-2,3-dihydro-1-benzopyran-4-one)

3D MOL for NP0266793 ((3r)-5,7-dihydroxy-3-(4-hydroxy-2-methoxyphenyl)-2,3-dihydro-1-benzopyran-4-one)

3D SDF for NP0266793 ((3r)-5,7-dihydroxy-3-(4-hydroxy-2-methoxyphenyl)-2,3-dihydro-1-benzopyran-4-one)

3D-SDF for NP0266793 ((3r)-5,7-dihydroxy-3-(4-hydroxy-2-methoxyphenyl)-2,3-dihydro-1-benzopyran-4-one)

PDB for NP0266793 ((3r)-5,7-dihydroxy-3-(4-hydroxy-2-methoxyphenyl)-2,3-dihydro-1-benzopyran-4-one)

3D PDB for NP0266793 ((3r)-5,7-dihydroxy-3-(4-hydroxy-2-methoxyphenyl)-2,3-dihydro-1-benzopyran-4-one)

SMILES for NP0266793 ((3r)-5,7-dihydroxy-3-(4-hydroxy-2-methoxyphenyl)-2,3-dihydro-1-benzopyran-4-one)

INCHI for NP0266793 ((3r)-5,7-dihydroxy-3-(4-hydroxy-2-methoxyphenyl)-2,3-dihydro-1-benzopyran-4-one)

Structure for NP0266793 ((3r)-5,7-dihydroxy-3-(4-hydroxy-2-methoxyphenyl)-2,3-dihydro-1-benzopyran-4-one)

3D Structure for NP0266793 ((3r)-5,7-dihydroxy-3-(4-hydroxy-2-methoxyphenyl)-2,3-dihydro-1-benzopyran-4-one)