cephalosporolide I

4-[(2R,3a′R,5R,6a′R)-6′,6′-Dimethyl-5′-oxohexahydro-3H,3′H-spiro[furan-2,2′-furo[3,2-b]furan]-5-yl]butanoic acid

cephalosporolide I

Spiro[furan-2(3H),2′(3′H)-furo[3,2-b]furan]-5-butanoic acid, hexahydro-6′,6′-dimethyl-5′-oxo-, (2R,3′aR,5R,6′aR)-