methyl 6-(3-methoxy-3-oxopropyl)-5-oxo-8-((triisopropylsilyl)oxy)-1,2,3,5-tetrahydroindolizine-3-carboxylate

甲基(2S)-5-甲氧基-3,4-二氢-2H-吡咯-2-羧酸酯

methyl (S,Z)-5-(2-(benzyloxy)-2-oxoethylidene)pyrrolidine-2-carboxylate

(S)-5-(2,2-Dimethyl-4,6-dioxo-[1,3]dioxan-5-ylidene)-pyrrolidine-2-carboxylic acid methyl ester

(S)-6-(3-methoxy-3-oxopropyl)-3-(methoxycarbonyl)-5-oxo-1,2,3,5-tetrahydroindolizine-8-carboxylic acid