9α,11-carbonyldioxy-12-(tert-butyl)dimethyl-silyldrim-7-ene

(1S,4aS,8aS)-5,5,8a-trimethyl-2'-oxo-4a,5,6,7,8,8a-hexahydro-4H-spiro[naphthalene-1,4'-[1,3]dioxolane]-2-carbaldehyde

abieta-7,13(14)-diene-18-oic acid