NP-MRD: Showing NP-Card for 3,6a-dihydroxy-7,7-dimethyl-1-oxo-3h,3ah,6h,8h,9h,10h-naphtho[4,4a-c]furan-4-carbaldehyde (NP0203800)

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Record Information

Version

2.0

Created at

2022-09-04 23:21:07 UTC

Updated at

2022-09-04 23:21:08 UTC

NP-MRD ID

NP0203800

Secondary Accession Numbers

None

Natural Product Identification

Common Name

3,6a-dihydroxy-7,7-dimethyl-1-oxo-3h,3ah,6h,8h,9h,10h-naphtho[4,4a-c]furan-4-carbaldehyde

Description

3,6A-dihydroxy-7,7-dimethyl-1-oxo-1H,3H,6H,6aH,7H,8H,9H,10H,10bH-naphtho[4,4a-c]furan-4-carbaldehyde belongs to the class of organic compounds known as naphthofurans. Naphthofurans are compounds containing a furan ring fused to a naphthalene moiety. Furan is a 5 membered- ring aromatic ring with four carbon and one oxygen atoms. Naphthalene is a polycyclic aromatic hydrocarbon made up of two fused benzene rings. Based on a literature review very few articles have been published on 3,6a-dihydroxy-7,7-dimethyl-1-oxo-1H,3H,6H,6aH,7H,8H,9H,10H,10bH-naphtho[4,4a-c]furan-4-carbaldehyde.

Structure

MOL 3D MOL SDF PDB SMILES InChI

     RDKit          3D

 40 42  0  0  0  0  0  0  0  0999 V2000
   -2.5103   -0.4617    1.0911 C   0  0  0  0  0  0  0  0  0  0  0  0
   -1.8567   -0.1562   -0.2252 C   0  0  0  0  0  0  0  0  0  0  0  0
   -2.4718   -1.0831   -1.2604 C   0  0  0  0  0  0  0  0  0  0  0  0
   -2.1600    1.2629   -0.6126 C   0  0  0  0  0  0  0  0  0  0  0  0
   -1.3427    2.2032    0.2054 C   0  0  0  0  0  0  0  0  0  0  0  0
    0.1191    1.9402    0.1779 C   0  0  0  0  0  0  0  0  0  0  0  0
    0.4241    0.5343    0.5953 C   0  0  2  0  0  0  0  0  0  0  0  0
    0.1861    0.3731    2.0517 C   0  0  0  0  0  0  0  0  0  0  0  0
   -0.4435    1.1255    2.8313 O   0  0  0  0  0  0  0  0  0  0  0  0
    0.8480   -0.8403    2.3360 O   0  0  0  0  0  0  0  0  0  0  0  0
    2.0311   -0.8971    1.5604 C   0  0  2  0  0  0  0  0  0  0  0  0
    3.0891   -0.6071    2.4099 O   0  0  0  0  0  0  0  0  0  0  0  0
    1.8723    0.1875    0.4865 C   0  0  1  0  0  0  0  0  0  0  0  0
    2.3246   -0.3143   -0.8041 C   0  0  0  0  0  0  0  0  0  0  0  0
    3.7783   -0.5797   -0.9683 C   0  0  0  0  0  0  0  0  0  0  0  0
    4.2219   -1.0133   -2.0617 O   0  0  0  0  0  0  0  0  0  0  0  0
    1.5163   -0.5333   -1.7976 C   0  0  0  0  0  0  0  0  0  0  0  0
    0.0727   -0.2799   -1.6678 C   0  0  0  0  0  0  0  0  0  0  0  0
   -0.3724   -0.4451   -0.2448 C   0  0  2  0  0  0  0  0  0  0  0  0
   -0.1838   -1.7428    0.1564 O   0  0  0  0  0  0  0  0  0  0  0  0
   -3.3920   -1.1045    0.9096 H   0  0  0  0  0  0  0  0  0  0  0  0
   -2.8178    0.4510    1.6410 H   0  0  0  0  0  0  0  0  0  0  0  0
   -1.8230   -1.0564    1.7274 H   0  0  0  0  0  0  0  0  0  0  0  0
   -1.9231   -2.0453   -1.2152 H   0  0  0  0  0  0  0  0  0  0  0  0
   -2.5122   -0.6347   -2.2590 H   0  0  0  0  0  0  0  0  0  0  0  0
   -3.5333   -1.3328   -0.9793 H   0  0  0  0  0  0  0  0  0  0  0  0
   -3.2308    1.4506   -0.3685 H   0  0  0  0  0  0  0  0  0  0  0  0
   -2.0516    1.4653   -1.6873 H   0  0  0  0  0  0  0  0  0  0  0  0
   -1.5220    3.2644   -0.1481 H   0  0  0  0  0  0  0  0  0  0  0  0
   -1.7288    2.2226    1.2545 H   0  0  0  0  0  0  0  0  0  0  0  0
    0.5908    2.6185    0.9425 H   0  0  0  0  0  0  0  0  0  0  0  0
    0.5590    2.1804   -0.8069 H   0  0  0  0  0  0  0  0  0  0  0  0
    2.2116   -1.8814    1.1168 H   0  0  0  0  0  0  0  0  0  0  0  0
    3.6215   -1.4047    2.6611 H   0  0  0  0  0  0  0  0  0  0  0  0
    2.4762    1.0583    0.8468 H   0  0  0  0  0  0  0  0  0  0  0  0
    4.4841   -0.4128   -0.1727 H   0  0  0  0  0  0  0  0  0  0  0  0
    1.9432   -0.9178   -2.7507 H   0  0  0  0  0  0  0  0  0  0  0  0
   -0.1903    0.7518   -2.0498 H   0  0  0  0  0  0  0  0  0  0  0  0
   -0.4326   -1.0209   -2.3447 H   0  0  0  0  0  0  0  0  0  0  0  0
    0.1284   -2.3243   -0.5768 H   0  0  0  0  0  0  0  0  0  0  0  0
  1  2  1  0
  2  3  1  0
  2  4  1  0
  4  5  1  0
  5  6  1  0
  6  7  1  0
  7 13  1  0
 13 11  1  0
 11 12  1  0
 11 10  1  0
 10  8  1  0
  8  9  2  0
 13 14  1  0
 14 15  1  0
 15 16  2  0
 14 17  2  0
 17 18  1  0
 18 19  1  0
 19 20  1  1
 19  2  1  0
  7  8  1  1
 19  7  1  0
  1 21  1  0
  1 22  1  0
  1 23  1  0
  3 24  1  0
  3 25  1  0
  3 26  1  0
  4 27  1  0
  4 28  1  0
  5 29  1  0
  5 30  1  0
  6 31  1  0
  6 32  1  0
 13 35  1  1
 11 33  1  6
 12 34  1  0
 15 36  1  0
 17 37  1  0
 18 38  1  0
 18 39  1  0
 20 40  1  0
M  END


  Mrv1652309052201212D          

 20 22  0  0  0  0            999 V2000
    2.0144   -2.3033    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    1.4884   -1.6677    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    0.9538   -2.2960    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    0.7768   -1.2503    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    0.7825   -0.4253    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    1.2739   -0.0766    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    2.2114   -0.4351    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    1.6021    0.1211    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    0.7939   -0.0449    0.0000 O   0  0  0  0  0  0  0  0  0  0  0  0
    1.9428    0.8725    0.0000 O   0  0  0  0  0  0  0  0  0  0  0  0
    2.7627    0.7806    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    3.3189    1.3899    0.0000 O   0  0  0  0  0  0  0  0  0  0  0  0
    2.9286   -0.0275    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    3.6403   -0.4449    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    4.3576   -0.0373    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    5.0692   -0.4547    0.0000 O   0  0  0  0  0  0  0  0  0  0  0  0
    3.6346   -1.2699    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    2.9173   -1.6775    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    2.2057   -1.2601    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    2.2000   -2.0851    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
  2  4  1  0  0  0  0
  4  5  1  0  0  0  0
  5  6  1  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  1  0  0  0  0
 11 12  1  0  0  0  0
 11 13  1  0  0  0  0
  7 13  1  0  0  0  0
 13 14  1  0  0  0  0
 14 15  1  0  0  0  0
 15 16  2  0  0  0  0
 14 17  2  0  0  0  0
 17 18  1  0  0  0  0
 18 19  1  0  0  0  0
  2 19  1  0  0  0  0
  7 19  1  0  0  0  0
 19 20  1  0  0  0  0
M  END
> <DATABASE_ID>
NP0203800

> <DATABASE_NAME>
NP-MRD

> <SMILES>
CC1(C)CCCC23C(C(O)OC2=O)C(C=O)=CCC13O

> <INCHI_IDENTIFIER>
InChI=1S/C15H20O5/c1-13(2)5-3-6-14-10(11(17)20-12(14)18)9(8-16)4-7-15(13,14)19/h4,8,10-11,17,19H,3,5-7H2,1-2H3

> <INCHI_KEY>
NIPAEGROZOLOHL-UHFFFAOYSA-N

> <FORMULA>
C15H20O5

> <MOLECULAR_WEIGHT>
280.32

> <EXACT_MASS>
280.131073744

> <JCHEM_ACCEPTOR_COUNT>
4

> <JCHEM_ATOM_COUNT>
40

> <JCHEM_AVERAGE_POLARIZABILITY>
27.999693911800726

> <JCHEM_BIOAVAILABILITY>
1

> <JCHEM_DONOR_COUNT>
2

> <JCHEM_FORMAL_CHARGE>
0

> <JCHEM_GHOSE_FILTER>
1

> <JCHEM_IUPAC>
3,6a-dihydroxy-7,7-dimethyl-1-oxo-1H,3H,6H,6aH,7H,8H,9H,10H,10bH-naphtho[4,4a-c]furan-4-carbaldehyde

> <JCHEM_LOGP>
0.7709818616666664

> <JCHEM_MDDR_LIKE_RULE>
0

> <JCHEM_NUMBER_OF_RINGS>
3

> <JCHEM_PHYSIOLOGICAL_CHARGE>
0

> <JCHEM_PKA>
13.701597980395483

> <JCHEM_PKA_STRONGEST_ACIDIC>
11.912697176692118

> <JCHEM_PKA_STRONGEST_BASIC>
-3.372857018679283

> <JCHEM_POLAR_SURFACE_AREA>
83.83

> <JCHEM_REFRACTIVITY>
70.8767

> <JCHEM_ROTATABLE_BOND_COUNT>
1

> <JCHEM_RULE_OF_FIVE>
1

> <JCHEM_TRADITIONAL_IUPAC>
3,6a-dihydroxy-7,7-dimethyl-1-oxo-3H,6H,8H,9H,10H,10bH-naphtho[4,4a-c]furan-4-carbaldehyde

> <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       3.760  -4.299   0.000  0.00  0.00           C+0
HETATM    2  C   UNK     0       2.778  -3.113   0.000  0.00  0.00           C+0
HETATM    3  C   UNK     0       1.780  -4.286   0.000  0.00  0.00           C+0
HETATM    4  C   UNK     0       1.450  -2.334   0.000  0.00  0.00           C+0
HETATM    5  C   UNK     0       1.461  -0.794   0.000  0.00  0.00           C+0
HETATM    6  C   UNK     0       2.378  -0.143   0.000  0.00  0.00           C+0
HETATM    7  C   UNK     0       4.128  -0.812   0.000  0.00  0.00           C+0
HETATM    8  C   UNK     0       2.991   0.226   0.000  0.00  0.00           C+0
HETATM    9  O   UNK     0       1.482  -0.084   0.000  0.00  0.00           O+0
HETATM   10  O   UNK     0       3.627   1.629   0.000  0.00  0.00           O+0
HETATM   11  C   UNK     0       5.157   1.457   0.000  0.00  0.00           C+0
HETATM   12  O   UNK     0       6.195   2.594   0.000  0.00  0.00           O+0
HETATM   13  C   UNK     0       5.467  -0.051   0.000  0.00  0.00           C+0
HETATM   14  C   UNK     0       6.795  -0.831   0.000  0.00  0.00           C+0
HETATM   15  C   UNK     0       8.134  -0.070   0.000  0.00  0.00           C+0
HETATM   16  O   UNK     0       9.462  -0.849   0.000  0.00  0.00           O+0
HETATM   17  C   UNK     0       6.785  -2.370   0.000  0.00  0.00           C+0
HETATM   18  C   UNK     0       5.446  -3.131   0.000  0.00  0.00           C+0
HETATM   19  C   UNK     0       4.117  -2.352   0.000  0.00  0.00           C+0
HETATM   20  O   UNK     0       4.107  -3.892   0.000  0.00  0.00           O+0
CONECT    1    2                                                            
CONECT    2    1    3    4   19                                             
CONECT    3    2                                                            
CONECT    4    2    5                                                       
CONECT    5    4    6                                                       
CONECT    6    5    7                                                       
CONECT    7    6    8   13   19                                             
CONECT    8    7    9   10                                                  
CONECT    9    8                                                            
CONECT   10    8   11                                                       
CONECT   11   10   12   13                                                  
CONECT   12   11                                                            
CONECT   13   11    7   14                                                  
CONECT   14   13   15   17                                                  
CONECT   15   14   16                                                       
CONECT   16   15                                                            
CONECT   17   14   18                                                       
CONECT   18   17   19                                                       
CONECT   19   18    2    7   20                                             
CONECT   20   19                                                            
MASTER        0    0    0    0    0    0    0    0   20    0   44    0
END

View in JSmol

Synonyms

Not Available

Chemical Formula

C₁₅H₂₀O₅

Average Mass

280.3200 Da

Monoisotopic Mass

280.13107 Da

IUPAC Name

3,6a-dihydroxy-7,7-dimethyl-1-oxo-1H,3H,6H,6aH,7H,8H,9H,10H,10bH-naphtho[4,4a-c]furan-4-carbaldehyde

Traditional Name

3,6a-dihydroxy-7,7-dimethyl-1-oxo-3H,6H,8H,9H,10H,10bH-naphtho[4,4a-c]furan-4-carbaldehyde

CAS Registry Number

Not Available

SMILES

CC1(C)CCCC23C(C(O)OC2=O)C(C=O)=CCC13O

InChI Identifier

InChI=1S/C15H20O5/c1-13(2)5-3-6-14-10(11(17)20-12(14)18)9(8-16)4-7-15(13,14)19/h4,8,10-11,17,19H,3,5-7H2,1-2H3

InChI Key

NIPAEGROZOLOHL-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

Not Available

Chemical Taxonomy

Description

Belongs to the class of organic compounds known as naphthofurans. Naphthofurans are compounds containing a furan ring fused to a naphthalene moiety. Furan is a 5 membered- ring aromatic ring with four carbon and one oxygen atoms. Naphthalene is a polycyclic aromatic hydrocarbon made up of two fused benzene rings.

Kingdom

Organic compounds

Super Class

Organoheterocyclic compounds

Class

Naphthofurans

Sub Class

Not Available

Direct Parent

Naphthofurans

Alternative Parents

Substituents

Naphthofuran
Gamma butyrolactone
Cyclic alcohol
Tertiary alcohol
Tetrahydrofuran
Carboxylic acid ester
Hemiacetal
Lactone
Monocarboxylic acid or derivatives
Carboxylic acid derivative
Oxacycle
Aldehyde
Organic oxide
Organic oxygen compound
Alcohol
Carbonyl group
Hydrocarbon derivative
Organooxygen compound
Aliphatic heteropolycyclic compound

Molecular Framework

Aliphatic 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	0.77	ChemAxon
pKa (Strongest Acidic)	11.91	ChemAxon
pKa (Strongest Basic)	-3.4	ChemAxon
Physiological Charge	0	ChemAxon
Hydrogen Acceptor Count	4	ChemAxon
Hydrogen Donor Count	2	ChemAxon
Polar Surface Area	83.83 Å²	ChemAxon
Rotatable Bond Count	1	ChemAxon
Refractivity	70.88 m³·mol⁻¹	ChemAxon
Polarizability	28 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

32679191

KEGG Compound ID

Not Available

BioCyc ID

Not Available

BiGG ID

Not Available

Wikipedia Link

Not Available

METLIN ID

Not Available

PubChem Compound

78131934

PDB ID

Not Available

ChEBI ID

Not Available

Good Scents ID

Not Available

References

General References

LOTUS database [Link]

Showing NP-Card for 3,6a-dihydroxy-7,7-dimethyl-1-oxo-3h,3ah,6h,8h,9h,10h-naphtho[4,4a-c]furan-4-carbaldehyde (NP0203800)

MOL for NP0203800 (3,6a-dihydroxy-7,7-dimethyl-1-oxo-3h,3ah,6h,8h,9h,10h-naphtho[4,4a-c]furan-4-carbaldehyde)

3D MOL for NP0203800 (3,6a-dihydroxy-7,7-dimethyl-1-oxo-3h,3ah,6h,8h,9h,10h-naphtho[4,4a-c]furan-4-carbaldehyde)

3D SDF for NP0203800 (3,6a-dihydroxy-7,7-dimethyl-1-oxo-3h,3ah,6h,8h,9h,10h-naphtho[4,4a-c]furan-4-carbaldehyde)

3D-SDF for NP0203800 (3,6a-dihydroxy-7,7-dimethyl-1-oxo-3h,3ah,6h,8h,9h,10h-naphtho[4,4a-c]furan-4-carbaldehyde)

PDB for NP0203800 (3,6a-dihydroxy-7,7-dimethyl-1-oxo-3h,3ah,6h,8h,9h,10h-naphtho[4,4a-c]furan-4-carbaldehyde)

3D PDB for NP0203800 (3,6a-dihydroxy-7,7-dimethyl-1-oxo-3h,3ah,6h,8h,9h,10h-naphtho[4,4a-c]furan-4-carbaldehyde)

SMILES for NP0203800 (3,6a-dihydroxy-7,7-dimethyl-1-oxo-3h,3ah,6h,8h,9h,10h-naphtho[4,4a-c]furan-4-carbaldehyde)

INCHI for NP0203800 (3,6a-dihydroxy-7,7-dimethyl-1-oxo-3h,3ah,6h,8h,9h,10h-naphtho[4,4a-c]furan-4-carbaldehyde)

Structure for NP0203800 (3,6a-dihydroxy-7,7-dimethyl-1-oxo-3h,3ah,6h,8h,9h,10h-naphtho[4,4a-c]furan-4-carbaldehyde)

3D Structure for NP0203800 (3,6a-dihydroxy-7,7-dimethyl-1-oxo-3h,3ah,6h,8h,9h,10h-naphtho[4,4a-c]furan-4-carbaldehyde)