(3aR,10aS,10bR)-octahydro-2H-furo[3,2-c]pyrrolo[1,2-a]azepine-2,8(1H)-dione

(3aR,9aS,9bR)-3a,6,8,9,9a,9b-Hexahydro-1H-3-oxa-6a-aza-cyclopenta[e]azulene-2,7-dione

(S)-1-((E)-But-2-enyl)-5-[(E)-(1R,2R)-1-((E)-2-methoxy-vinyl)-4-phenyl-2-triethylsilanyloxy-but-3-enyl]-pyrrolidin-2-one

(S)-1-((E)-But-2-enyl)-5-[(2R,3R)-5-oxo-2-((E)-styryl)-tetrahydro-furan-3-yl]-pyrrolidin-2-one

(E)-(2R,3R)-2-[(S)-1-((E)-But-2-enyl)-5-oxo-pyrrolidin-2-yl]-5-phenyl-3-triethylsilanyloxy-pent-4-enal