title: 16-O-Methyl-cafestol.
abstract: THE TITLE COMPOUND [SYSTEMATIC NAME: (3bS,5aS,7R,8R,10aR,10bS)-7-meth-oxy-10b-methyl-3b,4,5,6,7,8,9,10,10a,10b,11,12-dodeca-hydro-5a,8-methano-5aH-cyclo-hepta-l[5,6]naph-tho[2,1-b]furan-7-methanol], C(21)H(30)O(3), was isolated from the beans of Coffea robusta. The mol-ecule 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. Inter-molecular O-H⋯O hydrogen bonding is present in the crystal structure.
authors.forename: Xia-Li
authors.initials: XL
authors.lastname: Liao
authors.forename: Xiao-Zhen
authors.initials: XZ
authors.lastname: Chen
authors.forename: Kai-Bei
authors.initials: KB
authors.lastname: Yu
authors.forename: Guo-You
authors.initials: GY
authors.lastname: Li