(3aS,4S,9aS,9bS)-4-Iodo-octahydro-3-oxa-6a-aza-cyclopenta[e]azulene-2,7-dione

(1R,3aR,9aS,9bS)-1-Phenylselanyl-octahydro-3-oxa-6a-aza-cyclopenta[e]azulene-2,7-dione

(R)-3-((S)-1-But-3-enyl-5-oxo-pyrrolidin-2-yl)-pent-4-enoic acid methyl ester

(E)-3-((S)-1-But-3-enyl-5-oxo-pyrrolidin-2-yl)-acrylic acid methyl ester