(2S,4S)-4-Mercapto-2-(1-methyl-1H-tetrazol-5-ylsulfanylmethyl)-pyrrolidine-1-carboxylic acid allyl ester

(2S,4S)-4-Mercapto-2-(1-phenyl-1H-tetrazol-5-ylsulfanylmethyl)-pyrrolidine-1-carboxylic acid allyl ester

(2S,4S)-4-Mercapto-2-(1-pyridin-4-yl-1H-tetrazol-5-ylsulfanylmethyl)-pyrrolidine-1-carboxylic acid allyl ester

(2S,4S)-4-Mercapto-2-[1-(2-methylcarbamoyl-ethyl)-1H-tetrazol-5-ylsulfanylmethyl]-pyrrolidine-1-carboxylic acid allyl ester

(2S,4S)-2-[1-(2-Dimethylsulfamoyl-ethyl)-1H-tetrazol-5-ylsulfanylmethyl]-4-mercapto-pyrrolidine-1-carboxylic acid allyl ester