pentalenolactone F

(2R,4a′R,7a′S,9a′R)-6′,6′-Dimethyl-3′-oxo-1′,5′,6′,7′,7a′,9a′-hexahydrospiro[oxirane-2,4′-pentaleno[1,6a-c]pyran]-9′-carboxylic acid

pentalenolactone F

Spiro[oxirane-2,4′(3′H)-pentaleno[1,6a-c]pyran]-9′-carboxylic acid, 1′,5′,6′,7′,7′a,9′a-hexahydro-6′,6′-dimethyl-3′-oxo-, (2R,4a′R,7a′S,9a′R)-