(R,S)-3-<<(1,1-Dimethylethoxy)carbonyl>amino>-5-oxo-1-pyrrolidine acetic acid 、 alkaline earth salt of/the/ methylsulfuric acid 生成 (S)-2-[(S)-2-((S)-2-Amino-3-hydroxy-propionylamino)-5-guanidino-pentanoylamino]-4-methyl-pentanoic acid ((S)-1-{1-[((S)-1-carbamoyl-ethylcarbamoyl)-methyl]-5-oxo-pyrrolidin-3-ylcarbamoyl}-2-phenyl-ethyl)-amide