Acetic acid (3aR,6R,7S,7aR,8R)-7-acetoxy-6-benzyloxy-3a,4,6,7,7a,8-hexahydro-3H,5H-2-oxa-1,4a-diaza-s-indacen-8-yl ester

Acetic acid (2R,3S,4R)-2-((R)-1-acetoxy-2-hydroxyimino-ethyl)-1-allyl-4-benzyloxy-pyrrolidin-3-yl ester

Acetic acid (2S,3S,4R)-2-((R)-1-acetoxy-2,2-bis-ethylsulfanyl-ethyl)-1-allyl-4-benzyloxy-pyrrolidin-3-yl ester