(+/-)-(1α,4bβ,10α)-8,8-(Ethylenedioxy)-2-methoxy-1-(methoxycarbonyl)-7-<(methoxymethyl)oxy>-1-methylgibba-2,4a(10a)-diene-10-carboxylic acid

methyl 7-hydroxy-2-methoxy-8-oxo-6,8,9,10-tetrahydro-7H-7,9a-methanobenzo[a]azulene-1-carboxylate

methyl 7'-hydroxy-2'-methoxy-6',10'-dihydro-7'H,9'H-spiro[[1,3]dioxolane-2,8'-[7,9a]methanobenzo[a]azulene]-1'-carboxylate

(+/-)-(10α)-Dimethyl 8,8-(ethylenedioxy)-2-methoxy-7-<(methoxymethyl)oxy>gibba-1,3,4a(10a),4b-tetraene-1,10-dicarboxylate