84294-78-0 Isodonoic acid Spiro(cyclohexane-1,4'(3'H)-(1H-7,9a)methanocyclohepta(c)pyran)-2-carboxylic acid, 6-(acetyloxy)hexahydro-5'-hydroxy-3,3-dimethyl-8'-methylene-1',9'-dioxo-, (4'S-(4'alpha(2S*,6R*), 4'abeta,5'beta,7'alpha,9'aalpha))-