methyl (2S)-1-(4-benzyloxy-5-methoxy-2-nitrobenzoyl)-pyrrolidine-2-carboxylate

(2S)-N-(4-benzyloxy-5-methoxy-2-nitrobenzoyl)pyrrolidine-2-carboxaldehyde dimethyl acetal

香草酸

(S)-pyrrolidine-2-carbaldehyde diethyl acetal

(2S)-N-(2-amino-4-benzyloxy-5-methoxybenzoyl)pyrrolidine-2-carbaldehyde diethyl dithioacetal