methyl (3aS,3a1R,5aS,6R,7R,8S,8aR,9aR)-6-acetoxy-8a-hydroxy-2,2,3a1-trimethyl-4-oxo-7-(prop-1-en-2-yl)octahydro-4H-furo[2',3',4':7,1]indeno[1,2-d][1,3]dioxole-8-carboxylate

(1R,5S,8R,9S,11S)-9-Bromomethyl-5,9-dimethyl-10-oxa-tricyclo[6.2.1.01,5]undeca-3,6-diene-4,11-dicarboxylic acid

(2aS,2a1R,3R,4aR,5S,8R,8aS,9R)-2a1-methyl-9-(prop-1-en-2-yl)-2a,3,4a-tris((trimethylsilyl)oxy)octahydro-1,7-dioxa-5,8-methanocyclopenta[cd]azulene-2,6-dione

(2aS,3R,4aR,5S,6R,7R,7aS,7bR)-7-Hydroxy-6-isopropenyl-7b-methyl-2-oxo-2a,3,4a-tris-trimethylsilanyloxy-decahydro-indeno[7,1-bc]furan-5-carboxylic acid methyl ester