methyl (2R)-4-[(6-chlorobenzo[b]thiophen-2-yl)sulfonyl]-1-[(4-{[(1,3-dioxolan-2-ylmethyl)methylamino]iminomethyl}phenyl)methyl]-6-oxopiperazine-2-carboxylate 生成 (2R)-4-[(6-Chlorobenzo[b]thiophen-2-yl)sulfonyl]-1-[(4-{[(1,3-dioxolan-2-ylmethyl)methylamino]iminomethyl}phenyl)methyl]-6-oxopiperazine-2-carboxylic acid