16-O-Methylcafestol

Abstract

The title compound [systematic name: (3bS,5aS,7R,8R,10aR,10bS)-7-methoxy-10b-methyl-3b,4,5,6,7,8,9,10,10a,10b,11,12-dodecahydro-5a,8-methano-5aH-cycloheptal[5,6]naphtho[2,1-b]furan-7-methanol], C21H30O3, was isolated from the beans of Coffea robusta. The molecule contains five fused rings including a furan ring. The two six-membered rings are in chair conformations, but the third six-membered ring and the five-membered aliphatic ring adopt envelope conformations. Intermolecular O—H...O hydrogen bonding is present in the crystal structure.