(1'R,2S,2'R,3'S,7'R,9'R,10'R)-3',10'-dihydroxy-2'-(hydroxymethyl)-1',5'-dimethyl-8'-oxaspiro[oxirane-2,12'-tricyclo[7.2.1.02,7]dodecan]-5'-en-4'-one
(1'R,2S,2'R,3'S,7'R,9'R,10'R)-3',10'-dihydroxy-2'-(hydroxymethyl)-1',5'-dimethyl-8'-oxaspiro[oxirane-2,12'-tricyclo[7.2.1.0²,⁷]dodecan]-5'-en-4'-one