NP-MRD: Showing NP-Card for 1,7-dihydroxy-3-methyl-5-(λ⁵-diazynylidene)benzo[a]fluorene-6,11-dione (NP0217118)

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Record Information

Version

2.0

Created at

2022-09-05 17:21:09 UTC

Updated at

2022-09-05 17:21:09 UTC

NP-MRD ID

NP0217118

Secondary Accession Numbers

None

Natural Product Identification

Common Name

1,7-dihydroxy-3-methyl-5-(λ⁵-diazynylidene)benzo[a]fluorene-6,11-dione

Description

Isoprekinamycin belongs to the class of organic compounds known as fluorenes. Fluorenes are compounds containing a fluorene moiety, which consists of two benzene rings connected through either a cyclopentane, cyclopentene, or cyclopenta-1,3-diene. 1,7-dihydroxy-3-methyl-5-(λ⁵-diazynylidene)benzo[a]fluorene-6,11-dione is found in Streptomyces murayamaensis. 1,7-dihydroxy-3-methyl-5-(λ⁵-diazynylidene)benzo[a]fluorene-6,11-dione was first documented in 2007 (PMID: 17585773). Based on a literature review a small amount of articles have been published on Isoprekinamycin (PMID: 30656941) (PMID: 30465587) (PMID: 28044443) (PMID: 21048414).

Structure

MOL 3D MOL SDF PDB SMILES InChI

     RDKit          3D

 34 37  0  0  0  0  0  0  0  0999 V2000
    5.2550    0.0317    0.3128 C   0  0  0  0  0  0  0  0  0  0  0  0
    3.7635   -0.0917    0.1950 C   0  0  0  0  0  0  0  0  0  0  0  0
    3.2685   -1.3258   -0.1031 C   0  0  0  0  0  0  0  0  0  0  0  0
    1.8874   -1.4703   -0.2187 C   0  0  0  0  0  0  0  0  0  0  0  0
    1.3917   -2.7069   -0.5174 O   0  0  0  0  0  0  0  0  0  0  0  0
    1.0442   -0.3932   -0.0364 C   0  0  0  0  0  0  0  0  0  0  0  0
   -0.3421   -0.4712   -0.1379 C   0  0  0  0  0  0  0  0  0  0  0  0
   -1.1463   -1.5466   -0.4204 C   0  0  0  0  0  0  0  0  0  0  0  0
   -0.8444   -2.7366   -0.6603 O   0  0  0  0  0  0  0  0  0  0  0  0
   -2.4942   -1.1534   -0.4173 C   0  0  0  0  0  0  0  0  0  0  0  0
   -3.6601   -1.8350   -0.6364 C   0  0  0  0  0  0  0  0  0  0  0  0
   -4.8748   -1.1688   -0.5660 C   0  0  0  0  0  0  0  0  0  0  0  0
   -4.8938    0.1665   -0.2773 C   0  0  0  0  0  0  0  0  0  0  0  0
   -3.6901    0.8251   -0.0609 C   0  0  0  0  0  0  0  0  0  0  0  0
   -3.7058    2.1821    0.2327 O   0  0  0  0  0  0  0  0  0  0  0  0
   -2.4657    0.1845   -0.1252 C   0  0  0  0  0  0  0  0  0  0  0  0
   -1.1439    0.5886    0.0432 C   0  0  0  0  0  0  0  0  0  0  0  0
   -0.5850    1.8047    0.3412 C   0  0  0  0  0  0  0  0  0  0  0  0
   -1.3071    2.8491    0.5239 O   0  0  0  0  0  0  0  0  0  0  0  0
    0.7725    1.9780    0.4617 C   0  0  0  0  0  0  0  0  0  0  0  0
    1.3129    3.0790    0.7336 N   0  0  0  0  0  4  0  0  0  0  0  0
    1.7577    4.0956    1.2887 N   0  0  0  0  0  2  0  0  0  0  0  0
    1.5602    0.8673    0.2687 C   0  0  0  0  0  0  0  0  0  0  0  0
    2.9487    1.0002    0.3822 C   0  0  0  0  0  0  0  0  0  0  0  0
    5.7384    0.0194   -0.6857 H   0  0  0  0  0  0  0  0  0  0  0  0
    5.4823    0.9984    0.7861 H   0  0  0  0  0  0  0  0  0  0  0  0
    5.6457   -0.8266    0.9237 H   0  0  0  0  0  0  0  0  0  0  0  0
    3.8662   -2.2041   -0.2573 H   0  0  0  0  0  0  0  0  0  0  0  0
    1.8978   -3.5411   -0.6676 H   0  0  0  0  0  0  0  0  0  0  0  0
   -3.6288   -2.8910   -0.8637 H   0  0  0  0  0  0  0  0  0  0  0  0
   -5.8034   -1.6967   -0.7372 H   0  0  0  0  0  0  0  0  0  0  0  0
   -5.8060    0.7482   -0.2067 H   0  0  0  0  0  0  0  0  0  0  0  0
   -4.5817    2.6810    0.2875 H   0  0  0  0  0  0  0  0  0  0  0  0
    3.3806    1.9596    0.6168 H   0  0  0  0  0  0  0  0  0  0  0  0
  1  2  1  0
  2  3  2  0
  3  4  1  0
  4  5  1  0
  4  6  2  0
  6  7  1  0
  7 17  2  0
 17 16  1  0
 16 14  2  0
 14 15  1  0
 14 13  1  0
 13 12  2  0
 12 11  1  0
 11 10  2  0
 10  8  1  0
  8  9  2  0
 17 18  1  0
 18 19  2  0
 18 20  1  0
 20 21  2  0
 21 22  2  0
 20 23  1  0
 23 24  2  0
 24  2  1  0
 23  6  1  0
  8  7  1  0
 10 16  1  0
  1 25  1  0
  1 26  1  0
  1 27  1  0
  3 28  1  0
  5 29  1  0
 15 33  1  0
 13 32  1  0
 12 31  1  0
 11 30  1  0
 24 34  1  0
M  CHG  2  21   1  22  -1
M  END


  Mrv1652309052219212D          

 24 27  0  0  0  0            999 V2000
    1.0290   -2.7349    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    1.8527   -2.6877    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    2.2237   -1.9509    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    3.0473   -1.9037    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    3.4183   -1.1668    0.0000 O   0  0  0  0  0  0  0  0  0  0  0  0
    3.5000   -2.5934    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    4.3236   -2.5463    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    4.8397   -1.9027    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    4.6224   -1.1068    0.0000 O   0  0  0  0  0  0  0  0  0  0  0  0
    5.6113   -2.1946    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    6.3446   -1.8165    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    7.0387   -2.2625    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    6.9995   -3.0866    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    6.2662   -3.4647    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    6.2270   -4.2887    0.0000 O   0  0  0  0  0  0  0  0  0  0  0  0
    5.5721   -3.0187    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    4.7763   -3.2360    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    4.4053   -3.9729    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    4.8579   -4.6626    0.0000 O   0  0  0  0  0  0  0  0  0  0  0  0
    3.5816   -4.0200    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    3.2106   -4.7569    0.0000 N   0  3  0  0  0  0  0  0  0  0  0  0
    2.8396   -5.4938    0.0000 N   0  5  0  0  0  0  0  0  0  0  0  0
    3.1290   -3.3303    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    2.3053   -3.3775    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
  1  2  1  0  0  0  0
  2  3  2  0  0  0  0
  3  4  1  0  0  0  0
  4  5  1  0  0  0  0
  4  6  2  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 10  1  0  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
 14 15  1  0  0  0  0
 14 16  2  0  0  0  0
 10 16  1  0  0  0  0
 16 17  1  0  0  0  0
  7 17  2  0  0  0  0
 17 18  1  0  0  0  0
 18 19  2  0  0  0  0
 18 20  1  0  0  0  0
 20 21  2  0  0  0  0
 21 22  2  0  0  0  0
 20 23  1  0  0  0  0
  6 23  1  0  0  0  0
 23 24  2  0  0  0  0
  2 24  1  0  0  0  0
M  CHG  2  21   1  22  -1
M  END
> <DATABASE_ID>
NP0217118

> <DATABASE_NAME>
NP-MRD

> <SMILES>
CC1=CC(O)=C2C3=C(C4=C(O)C=CC=C4C3=O)C(=O)C(=[N+]=[N-])C2=C1

> <INCHI_IDENTIFIER>
InChI=1S/C18H10N2O4/c1-7-5-9-13(11(22)6-7)14-15(18(24)16(9)20-19)12-8(17(14)23)3-2-4-10(12)21/h2-6,21-22H,1H3

> <INCHI_KEY>
OWPHUUBRUYFHMJ-UHFFFAOYSA-N

> <FORMULA>
C18H10N2O4

> <MOLECULAR_WEIGHT>
318.288

> <EXACT_MASS>
318.06405681

> <JCHEM_ACCEPTOR_COUNT>
5

> <JCHEM_ATOM_COUNT>
34

> <JCHEM_AVERAGE_POLARIZABILITY>
31.793451076111175

> <JCHEM_BIOAVAILABILITY>
1

> <JCHEM_DONOR_COUNT>
2

> <JCHEM_FORMAL_CHARGE>
0

> <JCHEM_GHOSE_FILTER>
1

> <JCHEM_IUPAC>
3,12-dihydroxy-8-(-lambda5-diazynylidene)-5-methyltetracyclo[8.7.0.0^{2,7}.0^{11,16}]heptadeca-1(10),2(7),3,5,11(16),12,14-heptaene-9,17-dione

> <JCHEM_LOGP>
1.544417506790721

> <JCHEM_MDDR_LIKE_RULE>
0

> <JCHEM_NUMBER_OF_RINGS>
4

> <JCHEM_PHYSIOLOGICAL_CHARGE>
1

> <JCHEM_PKA>
8.12728069653963

> <JCHEM_PKA_STRONGEST_ACIDIC>
7.488435856517991

> <JCHEM_PKA_STRONGEST_BASIC>
-6.139364997191529

> <JCHEM_POLAR_SURFACE_AREA>
91.66999999999999

> <JCHEM_REFRACTIVITY>
86.07839999999999

> <JCHEM_ROTATABLE_BOND_COUNT>
0

> <JCHEM_RULE_OF_FIVE>
1

> <JCHEM_TRADITIONAL_IUPAC>
3,12-dihydroxy-8-(-lambda5-diazynylidene)-5-methyltetracyclo[8.7.0.0^{2,7}.0^{11,16}]heptadeca-1(10),2(7),3,5,11(16),12,14-heptaene-9,17-dione

> <JCHEM_VEBER_RULE>
0

$$$$

HEADER    PROTEIN                                 05-SEP-22   NONE
TITLE     NULL                                                        
COMPND    NULL                                                        
SOURCE    NULL                                                        
KEYWDS    NULL                                                        
EXPDTA    NULL                                                        
AUTHOR    Marvin                                                      
REVDAT   1   05-SEP-22         0                                  
HETATM    1  C   UNK     0       1.921  -5.105   0.000  0.00  0.00           C+0
HETATM    2  C   UNK     0       3.458  -5.017   0.000  0.00  0.00           C+0
HETATM    3  C   UNK     0       4.151  -3.642   0.000  0.00  0.00           C+0
HETATM    4  C   UNK     0       5.688  -3.554   0.000  0.00  0.00           C+0
HETATM    5  O   UNK     0       6.381  -2.178   0.000  0.00  0.00           O+0
HETATM    6  C   UNK     0       6.533  -4.841   0.000  0.00  0.00           C+0
HETATM    7  C   UNK     0       8.071  -4.753   0.000  0.00  0.00           C+0
HETATM    8  C   UNK     0       9.034  -3.552   0.000  0.00  0.00           C+0
HETATM    9  O   UNK     0       8.628  -2.066   0.000  0.00  0.00           O+0
HETATM   10  C   UNK     0      10.475  -4.097   0.000  0.00  0.00           C+0
HETATM   11  C   UNK     0      11.843  -3.391   0.000  0.00  0.00           C+0
HETATM   12  C   UNK     0      13.139  -4.223   0.000  0.00  0.00           C+0
HETATM   13  C   UNK     0      13.066  -5.762   0.000  0.00  0.00           C+0
HETATM   14  C   UNK     0      11.697  -6.467   0.000  0.00  0.00           C+0
HETATM   15  O   UNK     0      11.624  -8.006   0.000  0.00  0.00           O+0
HETATM   16  C   UNK     0      10.401  -5.635   0.000  0.00  0.00           C+0
HETATM   17  C   UNK     0       8.916  -6.041   0.000  0.00  0.00           C+0
HETATM   18  C   UNK     0       8.223  -7.416   0.000  0.00  0.00           C+0
HETATM   19  O   UNK     0       9.068  -8.704   0.000  0.00  0.00           O+0
HETATM   20  C   UNK     0       6.686  -7.504   0.000  0.00  0.00           C+0
HETATM   21  N   UNK     0       5.993  -8.880   0.000  0.00  0.00           N+1
HETATM   22  N   UNK     0       5.301 -10.255   0.000  0.00  0.00           N-1
HETATM   23  C   UNK     0       5.841  -6.217   0.000  0.00  0.00           C+0
HETATM   24  C   UNK     0       4.303  -6.305   0.000  0.00  0.00           C+0
CONECT    1    2                                                            
CONECT    2    1    3   24                                                  
CONECT    3    2    4                                                       
CONECT    4    3    5    6                                                  
CONECT    5    4                                                            
CONECT    6    4    7   23                                                  
CONECT    7    6    8   17                                                  
CONECT    8    7    9   10                                                  
CONECT    9    8                                                            
CONECT   10    8   11   16                                                  
CONECT   11   10   12                                                       
CONECT   12   11   13                                                       
CONECT   13   12   14                                                       
CONECT   14   13   15   16                                                  
CONECT   15   14                                                            
CONECT   16   14   10   17                                                  
CONECT   17   16    7   18                                                  
CONECT   18   17   19   20                                                  
CONECT   19   18                                                            
CONECT   20   18   21   23                                                  
CONECT   21   20   22                                                       
CONECT   22   21                                                            
CONECT   23   20    6   24                                                  
CONECT   24   23    2                                                       
MASTER        0    0    0    0    0    0    0    0   24    0   54    0
END

View in JSmol

Synonyms

Not Available

Chemical Formula

C₁₈H₁₀N₂O₄

Average Mass

318.2880 Da

Monoisotopic Mass

318.06406 Da

IUPAC Name

Not Available

Traditional Name

Not Available

CAS Registry Number

Not Available

SMILES

CC1=CC(O)=C2C3=C(C4=C(O)C=CC=C4C3=O)C(=O)C(=[N+]=[N-])C2=C1

InChI Identifier

InChI=1S/C18H10N2O4/c1-7-5-9-13(11(22)6-7)14-15(18(24)16(9)20-19)12-8(17(14)23)3-2-4-10(12)21/h2-6,21-22H,1H3

InChI Key

OWPHUUBRUYFHMJ-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
Streptomyces murayamaensis	LOTUS Database	35616633

Chemical Taxonomy

Description

Belongs to the class of organic compounds known as fluorenes. Fluorenes are compounds containing a fluorene moiety, which consists of two benzene rings connected through either a cyclopentane, cyclopentene, or cyclopenta-1,3-diene.

Kingdom

Organic compounds

Super Class

Benzenoids

Class

Fluorenes

Sub Class

Not Available

Direct Parent

Fluorenes

Alternative Parents

Substituents

Fluorene
1-naphthol
Naphthalene
Aryl ketone
Phenol
1-hydroxy-2-unsubstituted benzenoid
1-hydroxy-4-unsubstituted benzenoid
Diazo compound
Organic diazonium salt
Ketone
Organic oxide
Hydrocarbon derivative
Organic salt
Organic zwitterion
Organooxygen compound
Organic nitrogen compound
Organic oxygen compound
Aromatic homopolycyclic compound

Molecular Framework

Aromatic homopolycyclic 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

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

28284299

KEGG Compound ID

Not Available

BioCyc ID

Not Available

BiGG ID

Not Available

Wikipedia Link

Not Available

METLIN ID

Not Available

PubChem Compound

16748289

PDB ID

Not Available

ChEBI ID

Not Available

Good Scents ID

Not Available

References

General References

Tang SQ, Bricard J, Schmitt M, Bihel F: Fukuyama Cross-Coupling Approach to Isoprekinamycin: Discovery of the Highly Active and Bench-Stable Palladium Precatalyst POxAP. Org Lett. 2019 Feb 1;21(3):844-848. doi: 10.1021/acs.orglett.9b00031. Epub 2019 Jan 18. [PubMed:30656941 ]
Guo J, Peng X, Wang X, Xie F, Zhang X, Liang G, Sun Z, Liu Y, Cheng M, Liu Y: A gold-catalyzed cycloisomerization/aerobic oxidation cascade strategy for 2-aryl indenones from 1,5-enynes. Org Biomol Chem. 2018 Dec 5;16(47):9147-9151. doi: 10.1039/c8ob02582g. [PubMed:30465587 ]
Kawamura M, Kamo S, Azuma S, Kubo K, Sasamori T, Tokitoh N, Kuramochi K, Tsubaki K: Skeletal Rearrangements of Polycyclic alpha-Ketols. Org Lett. 2017 Jan 20;19(2):301-303. doi: 10.1021/acs.orglett.6b03541. Epub 2017 Jan 3. [PubMed:28044443 ]
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LOTUS database [Link]

Showing NP-Card for 1,7-dihydroxy-3-methyl-5-(λ⁵-diazynylidene)benzo[a]fluorene-6,11-dione (NP0217118)

MOL for NP0217118 (1,7-dihydroxy-3-methyl-5-(λ⁵-diazynylidene)benzo[a]fluorene-6,11-dione)

3D MOL for NP0217118 (1,7-dihydroxy-3-methyl-5-(λ⁵-diazynylidene)benzo[a]fluorene-6,11-dione)

3D SDF for NP0217118 (1,7-dihydroxy-3-methyl-5-(λ⁵-diazynylidene)benzo[a]fluorene-6,11-dione)

3D-SDF for NP0217118 (1,7-dihydroxy-3-methyl-5-(λ⁵-diazynylidene)benzo[a]fluorene-6,11-dione)

PDB for NP0217118 (1,7-dihydroxy-3-methyl-5-(λ⁵-diazynylidene)benzo[a]fluorene-6,11-dione)

3D PDB for NP0217118 (1,7-dihydroxy-3-methyl-5-(λ⁵-diazynylidene)benzo[a]fluorene-6,11-dione)

SMILES for NP0217118 (1,7-dihydroxy-3-methyl-5-(λ⁵-diazynylidene)benzo[a]fluorene-6,11-dione)

INCHI for NP0217118 (1,7-dihydroxy-3-methyl-5-(λ⁵-diazynylidene)benzo[a]fluorene-6,11-dione)

Structure for NP0217118 (1,7-dihydroxy-3-methyl-5-(λ⁵-diazynylidene)benzo[a]fluorene-6,11-dione)

3D Structure for NP0217118 (1,7-dihydroxy-3-methyl-5-(λ⁵-diazynylidene)benzo[a]fluorene-6,11-dione)