(3R,4R)-4-Benzyloxycarbonyloxy-3-((2'S,3'R)-1'-formyl-2-oxo-1,2-dihydro-spiro[indole-3,3'-pyrrolidin]-2'-ylmethyl)-2-[1-methoxy-meth-(E)-ylidene]-hexanoic acid methyl ester

(3R,4R)-4-Benzyloxycarbonyloxy-3-((2'R,3'S)-1'-formyl-2-oxo-1,2-dihydro-spiro[indole-3,3'-pyrrolidin]-2'-ylmethyl)-2-[1-methoxy-meth-(E)-ylidene]-hexanoic acid methyl ester

(3R,4R)-4-Benzyloxycarbonyloxy-3-{[2-(1H-indol-3-yl)-ethylcarbamoyl]-methyl}-2-[1-methoxy-meth-(E)-ylidene]-hexanoic acid methyl ester

((2R,3R)-2-Ethyl-5-oxo-tetrahydro-furan-3-yl)-ethylsulfanylcarbonyl-acetic acid methyl ester

(-)-(R)-5-ethyl-2(5H)-furanone