NP-MRD: Showing NP-Card for ethyl (2r)-7,8,9-trihydroxy-3,5-dioxo-1h,2h-cyclopenta[c]isochromene-2-carboxylate (NP0309314)

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Record Information

Version

2.0

Created at

2022-09-11 03:50:17 UTC

Updated at

2022-09-11 03:50:18 UTC

NP-MRD ID

NP0309314

Secondary Accession Numbers

None

Natural Product Identification

Common Name

ethyl (2r)-7,8,9-trihydroxy-3,5-dioxo-1h,2h-cyclopenta[c]isochromene-2-carboxylate

Description

Ethyl (2R)-7,8,9-trihydroxy-3,5-dioxo-1H,2H,3H,5H-cyclopenta[c]isochromene-2-carboxylate belongs to the class of organic compounds known as isocoumarins and derivatives. These are polycyclic compounds containing an isochromane which bears a ketone at the carbon C1. ethyl (2r)-7,8,9-trihydroxy-3,5-dioxo-1h,2h-cyclopenta[c]isochromene-2-carboxylate is found in Acer oblongum and Phyllanthus niruri. Based on a literature review very few articles have been published on ethyl (2R)-7,8,9-trihydroxy-3,5-dioxo-1H,2H,3H,5H-cyclopenta[c]isochromene-2-carboxylate.

Structure

MOL 3D MOL SDF PDB SMILES InChI

     RDKit          3D

 35 37  0  0  0  0  0  0  0  0999 V2000
   -4.7959    0.9572   -1.2365 C   0  0  0  0  0  0  0  0  0  0  0  0
   -4.4025   -0.4767   -0.9651 C   0  0  0  0  0  0  0  0  0  0  0  0
   -3.1597   -0.4908   -0.2511 O   0  0  0  0  0  0  0  0  0  0  0  0
   -3.0369    0.1178    0.9745 C   0  0  0  0  0  0  0  0  0  0  0  0
   -4.0361    0.6932    1.4684 O   0  0  0  0  0  0  0  0  0  0  0  0
   -1.7408    0.0824    1.6799 C   0  0  2  0  0  0  0  0  0  0  0  0
   -0.6313    0.7220    0.9098 C   0  0  0  0  0  0  0  0  0  0  0  0
    0.4887   -0.2460    0.9679 C   0  0  0  0  0  0  0  0  0  0  0  0
    0.0945   -1.4168    1.5795 C   0  0  0  0  0  0  0  0  0  0  0  0
    0.9156   -2.4263    1.7477 O   0  0  0  0  0  0  0  0  0  0  0  0
    2.1606   -2.3959    1.3499 C   0  0  0  0  0  0  0  0  0  0  0  0
    2.8798   -3.3964    1.5458 O   0  0  0  0  0  0  0  0  0  0  0  0
    2.6369   -1.2495    0.7231 C   0  0  0  0  0  0  0  0  0  0  0  0
    3.9446   -1.1837    0.2910 C   0  0  0  0  0  0  0  0  0  0  0  0
    4.3996   -0.0500   -0.3239 C   0  0  0  0  0  0  0  0  0  0  0  0
    5.7063    0.0619   -0.7750 O   0  0  0  0  0  0  0  0  0  0  0  0
    3.5641    1.0545   -0.5274 C   0  0  0  0  0  0  0  0  0  0  0  0
    4.0279    2.1834   -1.1431 O   0  0  0  0  0  0  0  0  0  0  0  0
    2.2648    0.9847   -0.0962 C   0  0  0  0  0  0  0  0  0  0  0  0
    1.3502    2.0107   -0.2424 O   0  0  0  0  0  0  0  0  0  0  0  0
    1.8040   -0.1687    0.5288 C   0  0  0  0  0  0  0  0  0  0  0  0
   -1.2988   -1.3077    1.9648 C   0  0  0  0  0  0  0  0  0  0  0  0
   -2.0285   -2.2077    2.4542 O   0  0  0  0  0  0  0  0  0  0  0  0
   -3.8535    1.5058   -1.4663 H   0  0  0  0  0  0  0  0  0  0  0  0
   -5.3314    1.3788   -0.3594 H   0  0  0  0  0  0  0  0  0  0  0  0
   -5.4405    0.9909   -2.1375 H   0  0  0  0  0  0  0  0  0  0  0  0
   -4.2034   -1.0097   -1.9253 H   0  0  0  0  0  0  0  0  0  0  0  0
   -5.1635   -1.0482   -0.4364 H   0  0  0  0  0  0  0  0  0  0  0  0
   -1.8679    0.5732    2.6770 H   0  0  0  0  0  0  0  0  0  0  0  0
   -0.3250    1.6996    1.3562 H   0  0  0  0  0  0  0  0  0  0  0  0
   -0.9185    0.9108   -0.1619 H   0  0  0  0  0  0  0  0  0  0  0  0
    4.5782   -2.0434    0.4546 H   0  0  0  0  0  0  0  0  0  0  0  0
    6.3719   -0.6951   -0.6643 H   0  0  0  0  0  0  0  0  0  0  0  0
    3.4823    2.9910   -1.3121 H   0  0  0  0  0  0  0  0  0  0  0  0
    1.5642    2.8948   -0.6784 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  2  0
  4  6  1  0
  6  7  1  0
  7  8  1  0
  8  9  2  0
  9 10  1  0
 10 11  1  0
 11 12  2  0
 11 13  1  0
 13 14  2  0
 14 15  1  0
 15 16  1  0
 15 17  2  0
 17 18  1  0
 17 19  1  0
 19 20  1  0
 19 21  2  0
  9 22  1  0
 22 23  2  0
 22  6  1  0
 21  8  1  0
 21 13  1  0
  1 24  1  0
  1 25  1  0
  1 26  1  0
  2 27  1  0
  2 28  1  0
  6 29  1  1
  7 30  1  0
  7 31  1  0
 14 32  1  0
 16 33  1  0
 18 34  1  0
 20 35  1  0
M  END


  Mrv1652309112205502D          

 23 25  0  0  1  0            999 V2000
    6.5166    0.8714    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    5.7896    1.2614    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    5.0883    0.8268    0.0000 O   0  0  0  0  0  0  0  0  0  0  0  0
    4.3613    1.2168    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    4.3355    2.0414    0.0000 O   0  0  0  0  0  0  0  0  0  0  0  0
    3.6601    0.7822    0.0000 C   0  0  2  0  0  0  0  0  0  0  0  0
    2.8963    1.0941    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    2.3637    0.4640    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    2.7983   -0.2372    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    2.4083   -0.9642    0.0000 O   0  0  0  0  0  0  0  0  0  0  0  0
    1.5837   -0.9900    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    1.1937   -1.7170    0.0000 O   0  0  0  0  0  0  0  0  0  0  0  0
    1.1491   -0.2887    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    0.3245   -0.3145    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
   -0.1101    0.3867    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
   -0.9347    0.3610    0.0000 O   0  0  0  0  0  0  0  0  0  0  0  0
    0.2799    1.1137    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
   -0.1547    1.8150    0.0000 O   0  0  0  0  0  0  0  0  0  0  0  0
    1.1045    1.1395    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    1.4944    1.8665    0.0000 O   0  0  0  0  0  0  0  0  0  0  0  0
    1.5391    0.4383    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    3.5995   -0.0406    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    4.2295   -0.5732    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  1  0  0  0  0
  4  5  2  0  0  0  0
  6  4  1  1  0  0  0
  6  7  1  0  0  0  0
  7  8  1  0  0  0  0
  8  9  2  0  0  0  0
  9 10  1  0  0  0  0
 10 11  1  0  0  0  0
 11 12  2  0  0  0  0
 11 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
 17 19  1  0  0  0  0
 19 20  1  0  0  0  0
 19 21  2  0  0  0  0
  8 21  1  0  0  0  0
 13 21  1  0  0  0  0
  9 22  1  0  0  0  0
  6 22  1  0  0  0  0
 22 23  2  0  0  0  0
M  END
> <DATABASE_ID>
NP0309314

> <DATABASE_NAME>
NP-MRD

> <SMILES>
CCOC(=O)[C@@H]1CC2=C(OC(=O)C3=CC(O)=C(O)C(O)=C23)C1=O

> <INCHI_IDENTIFIER>
InChI=1S/C15H12O8/c1-2-22-14(20)7-3-5-9-6(4-8(16)11(18)12(9)19)15(21)23-13(5)10(7)17/h4,7,16,18-19H,2-3H2,1H3/t7-/m1/s1

> <INCHI_KEY>
HJXJFWMRDBPCQA-SSDOTTSWSA-N

> <FORMULA>
C15H12O8

> <MOLECULAR_WEIGHT>
320.253

> <EXACT_MASS>
320.053217346

> <JCHEM_ACCEPTOR_COUNT>
6

> <JCHEM_ATOM_COUNT>
35

> <JCHEM_AVERAGE_POLARIZABILITY>
29.93873934364973

> <JCHEM_BIOAVAILABILITY>
1

> <JCHEM_DONOR_COUNT>
3

> <JCHEM_FORMAL_CHARGE>
0

> <JCHEM_GHOSE_FILTER>
1

> <JCHEM_IUPAC>
ethyl (2R)-7,8,9-trihydroxy-3,5-dioxo-1H,2H,3H,5H-cyclopenta[c]isochromene-2-carboxylate

> <JCHEM_LOGP>
1.4289631603333328

> <JCHEM_MDDR_LIKE_RULE>
0

> <JCHEM_NUMBER_OF_RINGS>
3

> <JCHEM_PHYSIOLOGICAL_CHARGE>
-1

> <JCHEM_PKA>
8.016902845260619

> <JCHEM_PKA_STRONGEST_ACIDIC>
6.686397212315867

> <JCHEM_PKA_STRONGEST_BASIC>
-6.731506262514974

> <JCHEM_POLAR_SURFACE_AREA>
130.36

> <JCHEM_REFRACTIVITY>
76.60019999999999

> <JCHEM_ROTATABLE_BOND_COUNT>
3

> <JCHEM_RULE_OF_FIVE>
1

> <JCHEM_TRADITIONAL_IUPAC>
ethyl (2R)-7,8,9-trihydroxy-3,5-dioxo-1H,2H-cyclopenta[c]isochromene-2-carboxylate

> <JCHEM_VEBER_RULE>
0

$$$$

HEADER    PROTEIN                                 11-SEP-22   NONE
TITLE     NULL                                                        
COMPND    NULL                                                        
SOURCE    NULL                                                        
KEYWDS    NULL                                                        
EXPDTA    NULL                                                        
AUTHOR    Marvin                                                      
REVDAT   1   11-SEP-22         0                                  
HETATM    1  C   UNK     0      12.164   1.627   0.000  0.00  0.00           C+0
HETATM    2  C   UNK     0      10.807   2.355   0.000  0.00  0.00           C+0
HETATM    3  O   UNK     0       9.498   1.543   0.000  0.00  0.00           O+0
HETATM    4  C   UNK     0       8.141   2.271   0.000  0.00  0.00           C+0
HETATM    5  O   UNK     0       8.093   3.811   0.000  0.00  0.00           O+0
HETATM    6  C   UNK     0       6.832   1.460   0.000  0.00  0.00           C+0
HETATM    7  C   UNK     0       5.406   2.042   0.000  0.00  0.00           C+0
HETATM    8  C   UNK     0       4.412   0.866   0.000  0.00  0.00           C+0
HETATM    9  C   UNK     0       5.223  -0.443   0.000  0.00  0.00           C+0
HETATM   10  O   UNK     0       4.495  -1.800   0.000  0.00  0.00           O+0
HETATM   11  C   UNK     0       2.956  -1.848   0.000  0.00  0.00           C+0
HETATM   12  O   UNK     0       2.228  -3.205   0.000  0.00  0.00           O+0
HETATM   13  C   UNK     0       2.145  -0.539   0.000  0.00  0.00           C+0
HETATM   14  C   UNK     0       0.606  -0.587   0.000  0.00  0.00           C+0
HETATM   15  C   UNK     0      -0.206   0.722   0.000  0.00  0.00           C+0
HETATM   16  O   UNK     0      -1.745   0.674   0.000  0.00  0.00           O+0
HETATM   17  C   UNK     0       0.522   2.079   0.000  0.00  0.00           C+0
HETATM   18  O   UNK     0      -0.289   3.388   0.000  0.00  0.00           O+0
HETATM   19  C   UNK     0       2.062   2.127   0.000  0.00  0.00           C+0
HETATM   20  O   UNK     0       2.790   3.484   0.000  0.00  0.00           O+0
HETATM   21  C   UNK     0       2.873   0.818   0.000  0.00  0.00           C+0
HETATM   22  C   UNK     0       6.719  -0.076   0.000  0.00  0.00           C+0
HETATM   23  O   UNK     0       7.895  -1.070   0.000  0.00  0.00           O+0
CONECT    1    2                                                            
CONECT    2    1    3                                                       
CONECT    3    2    4                                                       
CONECT    4    3    5    6                                                  
CONECT    5    4                                                            
CONECT    6    4    7   22                                                  
CONECT    7    6    8                                                       
CONECT    8    7    9   21                                                  
CONECT    9    8   10   22                                                  
CONECT   10    9   11                                                       
CONECT   11   10   12   13                                                  
CONECT   12   11                                                            
CONECT   13   11   14   21                                                  
CONECT   14   13   15                                                       
CONECT   15   14   16   17                                                  
CONECT   16   15                                                            
CONECT   17   15   18   19                                                  
CONECT   18   17                                                            
CONECT   19   17   20   21                                                  
CONECT   20   19                                                            
CONECT   21   19    8   13                                                  
CONECT   22    9    6   23                                                  
CONECT   23   22                                                            
MASTER        0    0    0    0    0    0    0    0   23    0   50    0
END

View in JSmol

Synonyms

Value	Source
Ethyl (2R)-7,8,9-trihydroxy-3,5-dioxo-1H,2H,3H,5H-cyclopenta[c]isochromene-2-carboxylic acid	Generator

Chemical Formula

C₁₅H₁₂O₈

Average Mass

320.2530 Da

Monoisotopic Mass

320.05322 Da

IUPAC Name

ethyl (2R)-7,8,9-trihydroxy-3,5-dioxo-1H,2H,3H,5H-cyclopenta[c]isochromene-2-carboxylate

Traditional Name

ethyl (2R)-7,8,9-trihydroxy-3,5-dioxo-1H,2H-cyclopenta[c]isochromene-2-carboxylate

CAS Registry Number

Not Available

SMILES

CCOC(=O)[C@@H]1CC2=C(OC(=O)C3=CC(O)=C(O)C(O)=C23)C1=O

InChI Identifier

InChI=1S/C15H12O8/c1-2-22-14(20)7-3-5-9-6(4-8(16)11(18)12(9)19)15(21)23-13(5)10(7)17/h4,7,16,18-19H,2-3H2,1H3/t7-/m1/s1

InChI Key

HJXJFWMRDBPCQA-SSDOTTSWSA-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
Acer oblongum	LOTUS Database	35616633
Phyllanthus niruri	LOTUS Database	35616633

Chemical Taxonomy

Description

Belongs to the class of organic compounds known as isocoumarins and derivatives. These are polycyclic compounds containing an isochromane which bears a ketone at the carbon C1.

Kingdom

Organic compounds

Super Class

Phenylpropanoids and polyketides

Class

Isocoumarins and derivatives

Sub Class

Not Available

Direct Parent

Isocoumarins and derivatives

Alternative Parents

Substituents

Isocoumarin
Benzopyran
2-benzopyran
Aryl alkyl ketone
Aryl ketone
1-hydroxy-4-unsubstituted benzenoid
1-hydroxy-2-unsubstituted benzenoid
Pyranone
Pyran
1,3-dicarbonyl compound
Benzenoid
Heteroaromatic compound
Carboxylic acid ester
Ketone
Lactone
Polyol
Monocarboxylic acid or derivatives
Carboxylic acid derivative
Oxacycle
Organoheterocyclic compound
Organooxygen compound
Carbonyl group
Organic oxygen compound
Organic oxide
Hydrocarbon derivative
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	1.43	ChemAxon
pKa (Strongest Acidic)	6.69	ChemAxon
pKa (Strongest Basic)	-6.7	ChemAxon
Physiological Charge	-1	ChemAxon
Hydrogen Acceptor Count	6	ChemAxon
Hydrogen Donor Count	3	ChemAxon
Polar Surface Area	130.36 Å²	ChemAxon
Rotatable Bond Count	3	ChemAxon
Refractivity	76.6 m³·mol⁻¹	ChemAxon
Polarizability	29.94 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

162887636

PDB ID

Not Available

ChEBI ID

Not Available

Good Scents ID

Not Available

References

General References

LOTUS database [Link]

Showing NP-Card for ethyl (2r)-7,8,9-trihydroxy-3,5-dioxo-1h,2h-cyclopenta[c]isochromene-2-carboxylate (NP0309314)

MOL for NP0309314 (ethyl (2r)-7,8,9-trihydroxy-3,5-dioxo-1h,2h-cyclopenta[c]isochromene-2-carboxylate)

3D MOL for NP0309314 (ethyl (2r)-7,8,9-trihydroxy-3,5-dioxo-1h,2h-cyclopenta[c]isochromene-2-carboxylate)

3D SDF for NP0309314 (ethyl (2r)-7,8,9-trihydroxy-3,5-dioxo-1h,2h-cyclopenta[c]isochromene-2-carboxylate)

3D-SDF for NP0309314 (ethyl (2r)-7,8,9-trihydroxy-3,5-dioxo-1h,2h-cyclopenta[c]isochromene-2-carboxylate)

PDB for NP0309314 (ethyl (2r)-7,8,9-trihydroxy-3,5-dioxo-1h,2h-cyclopenta[c]isochromene-2-carboxylate)

3D PDB for NP0309314 (ethyl (2r)-7,8,9-trihydroxy-3,5-dioxo-1h,2h-cyclopenta[c]isochromene-2-carboxylate)

SMILES for NP0309314 (ethyl (2r)-7,8,9-trihydroxy-3,5-dioxo-1h,2h-cyclopenta[c]isochromene-2-carboxylate)

INCHI for NP0309314 (ethyl (2r)-7,8,9-trihydroxy-3,5-dioxo-1h,2h-cyclopenta[c]isochromene-2-carboxylate)

Structure for NP0309314 (ethyl (2r)-7,8,9-trihydroxy-3,5-dioxo-1h,2h-cyclopenta[c]isochromene-2-carboxylate)

3D Structure for NP0309314 (ethyl (2r)-7,8,9-trihydroxy-3,5-dioxo-1h,2h-cyclopenta[c]isochromene-2-carboxylate)