螺普利

N-[1-(S)-乙氧羰基-3-苯丙基]-L-丙氨酸

(8S)-1,4-dithia-7-azaspiro[4.4]nonane-8-carboxylic acid

N-Cbz-4-keto-L-proline ethyl ester

N-[(phenylmethoxy)carbonyl]-1,4-dithia-7-azaspiro[4.4]nonane-8(S)-carboxylic acid ethyl ester