NP-MRD: Showing NP-Card for 4a,6-dihydroxy-3,5-dimethylidene-hexahydro-3ah-spiro[azuleno[6,5-b]furan-8,2'-oxiran]-2-one (NP0292715)

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Record Information

Version

2.0

Created at

2022-09-10 00:22:56 UTC

Updated at

2022-09-10 00:22:56 UTC

NP-MRD ID

NP0292715

Secondary Accession Numbers

None

Natural Product Identification

Common Name

4a,6-dihydroxy-3,5-dimethylidene-hexahydro-3ah-spiro[azuleno[6,5-b]furan-8,2'-oxiran]-2-one

Description

4A,6-dihydroxy-3,5-dimethylidene-decahydro-2H-spiro[azuleno[6,5-b]furan-8,2'-oxirane]-2-one belongs to the class of organic compounds known as guaianolides and derivatives. These are diterpene lactones with a structure characterized by the presence of a gamma-lactone fused to a guaiane, forming 3,6,9-trimethyl-azuleno[4,5-b]furan-2-one or a derivative. 4a,6-dihydroxy-3,5-dimethylidene-hexahydro-3ah-spiro[azuleno[6,5-b]furan-8,2'-oxiran]-2-one is found in Arctotis stoechadifolia. 4A,6-dihydroxy-3,5-dimethylidene-decahydro-2H-spiro[azuleno[6,5-b]furan-8,2'-oxirane]-2-one is an extremely weak basic (essentially neutral) compound (based on its pKa).

Structure

MOL 3D MOL SDF PDB SMILES InChI

     RDKit          3D

 38 41  0  0  0  0  0  0  0  0999 V2000
    2.4930    1.6795    1.3095 C   0  0  0  0  0  0  0  0  0  0  0  0
    2.5893    1.0577    0.1727 C   0  0  0  0  0  0  0  0  0  0  0  0
    3.6497    0.1556   -0.3020 C   0  0  0  0  0  0  0  0  0  0  0  0
    4.7020   -0.1472    0.3280 O   0  0  0  0  0  0  0  0  0  0  0  0
    3.2629   -0.2969   -1.5818 O   0  0  0  0  0  0  0  0  0  0  0  0
    1.8197   -0.2834   -1.5225 C   0  0  1  0  0  0  0  0  0  0  0  0
    1.4920   -1.3816   -0.5490 C   0  0  0  0  0  0  0  0  0  0  0  0
    0.0615   -1.7907   -0.5326 C   0  0  2  0  0  0  0  0  0  0  0  0
   -0.2854   -2.7688    0.5702 C   0  0  0  0  0  0  0  0  0  0  0  0
   -0.3332   -3.0815   -0.8006 O   0  0  0  0  0  0  0  0  0  0  0  0
   -0.8879   -0.6535   -0.8202 C   0  0  1  0  0  0  0  0  0  0  0  0
   -2.3044   -1.0299   -0.5572 C   0  0  0  0  0  0  0  0  0  0  0  0
   -2.7489   -0.1802    0.6394 C   0  0  2  0  0  0  0  0  0  0  0  0
   -4.0963    0.1414    0.5439 O   0  0  0  0  0  0  0  0  0  0  0  0
   -1.8734    1.0085    0.4742 C   0  0  0  0  0  0  0  0  0  0  0  0
   -2.2531    2.2565    0.6211 C   0  0  0  0  0  0  0  0  0  0  0  0
   -0.5357    0.4735    0.1213 C   0  0  1  0  0  0  0  0  0  0  0  0
    0.0623    0.0387    1.2910 O   0  0  0  0  0  0  0  0  0  0  0  0
    0.2660    1.4804   -0.6191 C   0  0  0  0  0  0  0  0  0  0  0  0
    1.6408    1.0984   -0.9544 C   0  0  1  0  0  0  0  0  0  0  0  0
    1.6460    2.3091    1.5046 H   0  0  0  0  0  0  0  0  0  0  0  0
    3.2432    1.5875    2.0797 H   0  0  0  0  0  0  0  0  0  0  0  0
    1.4037   -0.4151   -2.5182 H   0  0  0  0  0  0  0  0  0  0  0  0
    1.9026   -1.1163    0.4327 H   0  0  0  0  0  0  0  0  0  0  0  0
    2.0866   -2.2821   -0.8874 H   0  0  0  0  0  0  0  0  0  0  0  0
   -1.2182   -2.6705    1.1298 H   0  0  0  0  0  0  0  0  0  0  0  0
    0.5372   -3.2653    1.1262 H   0  0  0  0  0  0  0  0  0  0  0  0
   -0.7720   -0.3584   -1.8842 H   0  0  0  0  0  0  0  0  0  0  0  0
   -2.9917   -0.7204   -1.3925 H   0  0  0  0  0  0  0  0  0  0  0  0
   -2.4856   -2.0938   -0.3838 H   0  0  0  0  0  0  0  0  0  0  0  0
   -2.4811   -0.6533    1.5929 H   0  0  0  0  0  0  0  0  0  0  0  0
   -4.6156   -0.2961    1.2745 H   0  0  0  0  0  0  0  0  0  0  0  0
   -3.2728    2.4754    0.8820 H   0  0  0  0  0  0  0  0  0  0  0  0
   -1.5694    3.0786    0.4876 H   0  0  0  0  0  0  0  0  0  0  0  0
   -0.2032    0.6894    2.0099 H   0  0  0  0  0  0  0  0  0  0  0  0
    0.2885    2.4179   -0.0275 H   0  0  0  0  0  0  0  0  0  0  0  0
   -0.2790    1.7314   -1.5570 H   0  0  0  0  0  0  0  0  0  0  0  0
    2.0598    1.8055   -1.7011 H   0  0  0  0  0  0  0  0  0  0  0  0
 14 13  1  0
 13 12  1  0
 12 11  1  0
 11  8  1  0
  8  9  1  0
  9 10  1  0
  8  7  1  0
  7  6  1  0
  6  5  1  0
  5  3  1  0
  3  4  2  0
  3  2  1  0
  2  1  2  3
  2 20  1  0
 20 19  1  0
 19 17  1  0
 17 18  1  1
 17 15  1  0
 15 16  2  3
 15 13  1  0
 17 11  1  0
  8 10  1  6
 20  6  1  0
 14 32  1  0
 13 31  1  1
 12 29  1  0
 12 30  1  0
 11 28  1  6
  9 26  1  0
  9 27  1  0
  7 24  1  0
  7 25  1  0
  6 23  1  6
  1 21  1  0
  1 22  1  0
 20 38  1  6
 19 36  1  0
 19 37  1  0
 18 35  1  0
 16 33  1  0
 16 34  1  0
M  END


  Mrv1533004201502282D          

 20 23  0  0  0  0            999 V2000
   -1.5200   -0.3613    0.0000 O   0  0  0  0  0  0  0  0  0  0  0  0
   -0.7157   -0.5449    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
   -0.3914   -1.3035    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    0.4302   -1.2296    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    0.6138   -0.4253    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    0.6508    0.3989    0.0000 O   0  0  0  0  0  0  0  0  0  0  0  0
    1.3571   -0.0673    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    2.1004   -0.4253    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    2.2840   -1.2296    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    1.7696   -1.8746    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    0.9446   -1.8746    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    1.0063   -2.6973    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    0.2630   -2.3393    0.0000 O   0  0  0  0  0  0  0  0  0  0  0  0
    3.1057   -1.3035    0.0000 O   0  0  0  0  0  0  0  0  0  0  0  0
    3.4299   -0.5449    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    4.2342   -0.3613    0.0000 O   0  0  0  0  0  0  0  0  0  0  0  0
    2.8086   -0.0021    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
    2.8826    0.8196    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
   -0.0944   -0.0021    0.0000 C   0  0  0  0  0  0  0  0  0  0  0  0
   -0.1683    0.8196    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  1  0  0  0  0
  4  5  1  0  0  0  0
  5  6  1  0  0  0  0
  5  7  1  0  0  0  0
  7  8  1  0  0  0  0
  8  9  1  0  0  0  0
  9 10  1  0  0  0  0
 10 11  1  0  0  0  0
  4 11  1  0  0  0  0
 11 12  1  0  0  0  0
 12 13  1  0  0  0  0
 11 13  1  0  0  0  0
  9 14  1  0  0  0  0
 14 15  1  0  0  0  0
 15 16  2  0  0  0  0
 15 17  1  0  0  0  0
  8 17  1  0  0  0  0
 17 18  2  0  0  0  0
  5 19  1  0  0  0  0
  2 19  1  0  0  0  0
 19 20  2  0  0  0  0
M  END
> <DATABASE_ID>
NP0292715

> <DATABASE_NAME>
NP-MRD

> <SMILES>
OC1CC2C3(CO3)CC3OC(=O)C(=C)C3CC2(O)C1=C

> <INCHI_IDENTIFIER>
InChI=1S/C15H18O5/c1-7-9-4-15(18)8(2)10(16)3-12(15)14(6-19-14)5-11(9)20-13(7)17/h9-12,16,18H,1-6H2

> <INCHI_KEY>
NRQMQZXLJOVXEZ-UHFFFAOYSA-N

> <FORMULA>
C15H18O5

> <MOLECULAR_WEIGHT>
278.304

> <EXACT_MASS>
278.11542368

> <JCHEM_ACCEPTOR_COUNT>
4

> <JCHEM_ATOM_COUNT>
38

> <JCHEM_AVERAGE_POLARIZABILITY>
28.096810936713716

> <JCHEM_BIOAVAILABILITY>
1

> <JCHEM_DONOR_COUNT>
2

> <JCHEM_FORMAL_CHARGE>
0

> <JCHEM_GHOSE_FILTER>
1

> <JCHEM_IUPAC>
4a,6-dihydroxy-3,5-dimethylidene-decahydro-2H-spiro[azuleno[6,5-b]furan-8,2'-oxirane]-2-one

> <ALOGPS_LOGP>
-0.27

> <JCHEM_LOGP>
-0.2768144319999996

> <ALOGPS_LOGS>
-1.35

> <JCHEM_MDDR_LIKE_RULE>
0

> <JCHEM_NUMBER_OF_RINGS>
4

> <JCHEM_PHYSIOLOGICAL_CHARGE>
0

> <JCHEM_PKA>
14.705814016850322

> <JCHEM_PKA_STRONGEST_ACIDIC>
13.749191101172283

> <JCHEM_PKA_STRONGEST_BASIC>
-3.002944078176

> <JCHEM_POLAR_SURFACE_AREA>
79.28999999999999

> <JCHEM_REFRACTIVITY>
68.8878

> <JCHEM_ROTATABLE_BOND_COUNT>
0

> <JCHEM_RULE_OF_FIVE>
1

> <ALOGPS_SOLUBILITY>
1.25e+01 g/l

> <JCHEM_TRADITIONAL_IUPAC>
4a,6-dihydroxy-3,5-dimethylidene-hexahydro-3aH-spiro[azuleno[6,5-b]furan-8,2'-oxirane]-2-one

> <JCHEM_VEBER_RULE>
0

$$$$

HEADER    PROTEIN                                 20-APR-15   NONE
TITLE     NULL                                                        
COMPND    NULL                                                        
SOURCE    NULL                                                        
KEYWDS    NULL                                                        
EXPDTA    NULL                                                        
AUTHOR    Marvin                                                      
REVDAT   1   20-APR-15         0                                  
HETATM    1  O   UNK     0      -2.837  -0.674   0.000  0.00  0.00           O+0
HETATM    2  C   UNK     0      -1.336  -1.017   0.000  0.00  0.00           C+0
HETATM    3  C   UNK     0      -0.731  -2.433   0.000  0.00  0.00           C+0
HETATM    4  C   UNK     0       0.803  -2.295   0.000  0.00  0.00           C+0
HETATM    5  C   UNK     0       1.146  -0.794   0.000  0.00  0.00           C+0
HETATM    6  O   UNK     0       1.215   0.745   0.000  0.00  0.00           O+0
HETATM    7  C   UNK     0       2.533  -0.126   0.000  0.00  0.00           C+0
HETATM    8  C   UNK     0       3.921  -0.794   0.000  0.00  0.00           C+0
HETATM    9  C   UNK     0       4.263  -2.295   0.000  0.00  0.00           C+0
HETATM   10  C   UNK     0       3.303  -3.499   0.000  0.00  0.00           C+0
HETATM   11  C   UNK     0       1.763  -3.499   0.000  0.00  0.00           C+0
HETATM   12  C   UNK     0       1.878  -5.035   0.000  0.00  0.00           C+0
HETATM   13  O   UNK     0       0.491  -4.367   0.000  0.00  0.00           O+0
HETATM   14  O   UNK     0       5.797  -2.433   0.000  0.00  0.00           O+0
HETATM   15  C   UNK     0       6.403  -1.017   0.000  0.00  0.00           C+0
HETATM   16  O   UNK     0       7.904  -0.674   0.000  0.00  0.00           O+0
HETATM   17  C   UNK     0       5.243  -0.004   0.000  0.00  0.00           C+0
HETATM   18  C   UNK     0       5.381   1.530   0.000  0.00  0.00           C+0
HETATM   19  C   UNK     0      -0.176  -0.004   0.000  0.00  0.00           C+0
HETATM   20  C   UNK     0      -0.314   1.530   0.000  0.00  0.00           C+0
CONECT    1    2                                                            
CONECT    2    1    3   19                                                  
CONECT    3    2    4                                                       
CONECT    4    3    5   11                                                  
CONECT    5    4    6    7   19                                             
CONECT    6    5                                                            
CONECT    7    5    8                                                       
CONECT    8    7    9   17                                                  
CONECT    9    8   10   14                                                  
CONECT   10    9   11                                                       
CONECT   11   10    4   12   13                                             
CONECT   12   11   13                                                       
CONECT   13   12   11                                                       
CONECT   14    9   15                                                       
CONECT   15   14   16   17                                                  
CONECT   16   15                                                            
CONECT   17   15    8   18                                                  
CONECT   18   17                                                            
CONECT   19    5    2   20                                                  
CONECT   20   19                                                            
MASTER        0    0    0    0    0    0    0    0   20    0   46    0
END

View in JSmol

Synonyms

Not Available

Chemical Formula

C₁₅H₁₈O₅

Average Mass

278.3040 Da

Monoisotopic Mass

278.11542 Da

IUPAC Name

4a,6-dihydroxy-3,5-dimethylidene-decahydro-2H-spiro[azuleno[6,5-b]furan-8,2'-oxirane]-2-one

Traditional Name

4a,6-dihydroxy-3,5-dimethylidene-hexahydro-3aH-spiro[azuleno[6,5-b]furan-8,2'-oxirane]-2-one

CAS Registry Number

Not Available

SMILES

OC1CC2C3(CO3)CC3OC(=O)C(=C)C3CC2(O)C1=C

InChI Identifier

InChI=1S/C15H18O5/c1-7-9-4-15(18)8(2)10(16)3-12(15)14(6-19-14)5-11(9)20-13(7)17/h9-12,16,18H,1-6H2

InChI Key

NRQMQZXLJOVXEZ-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
Arctotis stoechadifolia	LOTUS Database	35616633

Chemical Taxonomy

Description

Belongs to the class of organic compounds known as guaianolides and derivatives. These are diterpene lactones with a structure characterized by the presence of a gamma-lactone fused to a guaiane, forming 3,6,9-trimethyl-azuleno[4,5-b]furan-2-one or a derivative.

Kingdom

Organic compounds

Super Class

Lipids and lipid-like molecules

Class

Prenol lipids

Sub Class

Terpene lactones

Direct Parent

Guaianolides and derivatives

Alternative Parents

Substituents

Guaianolide-skeleton
Sesquiterpenoid
Gamma butyrolactone
Cyclic alcohol
Alpha,beta-unsaturated carboxylic ester
Enoate ester
Tetrahydrofuran
Tertiary alcohol
Carboxylic acid ester
Lactone
Secondary alcohol
Carboxylic acid derivative
Dialkyl ether
Oxirane
Ether
Oxacycle
Organoheterocyclic compound
Monocarboxylic acid or derivatives
Carbonyl group
Alcohol
Hydrocarbon derivative
Organic oxygen compound
Organic oxide
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	-0.27	ALOGPS
logP	-0.28	ChemAxon
logS	-1.4	ALOGPS
pKa (Strongest Acidic)	13.75	ChemAxon
pKa (Strongest Basic)	-3	ChemAxon
Physiological Charge	0	ChemAxon
Hydrogen Acceptor Count	4	ChemAxon
Hydrogen Donor Count	2	ChemAxon
Polar Surface Area	79.29 Å²	ChemAxon
Rotatable Bond Count	0	ChemAxon
Refractivity	68.89 m³·mol⁻¹	ChemAxon
Polarizability	28.1 Å³	ChemAxon
Number of Rings	4	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

14285667

PDB ID

Not Available

ChEBI ID

Not Available

Good Scents ID

Not Available

References

General References

LOTUS database [Link]

Showing NP-Card for 4a,6-dihydroxy-3,5-dimethylidene-hexahydro-3ah-spiro[azuleno[6,5-b]furan-8,2'-oxiran]-2-one (NP0292715)

MOL for NP0292715 (4a,6-dihydroxy-3,5-dimethylidene-hexahydro-3ah-spiro[azuleno[6,5-b]furan-8,2'-oxiran]-2-one)

3D MOL for NP0292715 (4a,6-dihydroxy-3,5-dimethylidene-hexahydro-3ah-spiro[azuleno[6,5-b]furan-8,2'-oxiran]-2-one)

3D SDF for NP0292715 (4a,6-dihydroxy-3,5-dimethylidene-hexahydro-3ah-spiro[azuleno[6,5-b]furan-8,2'-oxiran]-2-one)

3D-SDF for NP0292715 (4a,6-dihydroxy-3,5-dimethylidene-hexahydro-3ah-spiro[azuleno[6,5-b]furan-8,2'-oxiran]-2-one)

PDB for NP0292715 (4a,6-dihydroxy-3,5-dimethylidene-hexahydro-3ah-spiro[azuleno[6,5-b]furan-8,2'-oxiran]-2-one)

3D PDB for NP0292715 (4a,6-dihydroxy-3,5-dimethylidene-hexahydro-3ah-spiro[azuleno[6,5-b]furan-8,2'-oxiran]-2-one)

SMILES for NP0292715 (4a,6-dihydroxy-3,5-dimethylidene-hexahydro-3ah-spiro[azuleno[6,5-b]furan-8,2'-oxiran]-2-one)

INCHI for NP0292715 (4a,6-dihydroxy-3,5-dimethylidene-hexahydro-3ah-spiro[azuleno[6,5-b]furan-8,2'-oxiran]-2-one)

Structure for NP0292715 (4a,6-dihydroxy-3,5-dimethylidene-hexahydro-3ah-spiro[azuleno[6,5-b]furan-8,2'-oxiran]-2-one)

3D Structure for NP0292715 (4a,6-dihydroxy-3,5-dimethylidene-hexahydro-3ah-spiro[azuleno[6,5-b]furan-8,2'-oxiran]-2-one)