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

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

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

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

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