(E)-3-Benzo[1,3]dioxol-5-yl-3-[(4R,5S)-2,2,5-trimethyl-5-(2-oxo-ethyl)-[1,3]dioxolan-4-yl]-acrylic acid ethyl ester

2,2-Dimethyl-propionic acid (3R,4R,5S)-4-benzo[1,3]dioxol-5-yl-1,4-diformyl-5-(2-oxo-propyl)-pyrrolidin-3-yl ester

(3aS,4aS,7R,7aR,7bR)-7a-Benzo[1,3]dioxol-5-yl-7-hydroxy-2,2,3a-trimethyl-hexahydro-[1,3]dioxolo[4',5':3,4]cyclopenta[1,2-b]pyrrol-6-one

(2E,4R,5S)-3-(1,3-benzodioxole-5-yl)-7,7-dimethoxy-4,5-O-isopropylidene-5-methyl-2-heptenoate

2,2-Dimethyl-propionic acid (3aS,4aS,7R,7aR,7bR)-7a-benzo[1,3]dioxol-5-yl-5-formyl-2,2,3a-trimethyl-octahydro-[1,3]dioxolo[4',5':3,4]cyclopenta[1,2-b]pyrrol-7-yl ester