(S)-3-{2-[2-(tert-Butyl-dimethyl-silanyloxymethyl)-pyridin-3-yl]-ethyl}-4-vinyl-oxazolidin-2-one

3-[(3S,4S,5S)-5-carboxy-4-(carboxymethyl)pyrrolidin-3-yl]pyridine-2-carboxylic acid

(6aR,6bS,10aS)-5,9-Dioxo-6b,7,10,10a-tetrahydro-5H,6aH-8-oxa-4,9a-diaza-pentaleno[2,1-a]naphthalene-6,6-dicarboxylic acid di-tert-butyl ester

2-[(2S,3R,4S)-2-Hydroxymethyl-1-methoxycarbonyl-4-(2-methoxycarbonyl-pyridin-3-yl)-pyrrolidin-3-yl]-malonic acid di-tert-butyl ester