penisporolide B

(2R,3a′S,5R,6a′S)-6′,6′-Dimethyl-5-(3-oxohexyl)hexahydro-3H,5′H-spiro[furan-2,2′-furo[3,2-b]furan]-5′-one

penisporolide B

Spiro[furan-2(3H),2′(5′H)-furo[3,2-b]furan]-5′-one, hexahydro-6′,6′-dimethyl-5-(3-oxohexyl)-, (2R,3a′S,5R,6a′S)-