2-{4-[(E)-(9S,10S,14R,18S)-18-Carbamoylmethyl-9-carboxymethyl-14-(5-methyl-indol-1-ylmethyl)-8,17,20-trioxo-7,16,19-triaza-spiro[5.14]icos-11-en-10-yl]-phenyl}-malonic acid 在
lithium hydroxide 作用下,
反应 4.0h,
以19%的产率得到[(E)-(9S,10S,14R,18S)-18-Carbamoylmethyl-10-(4-carboxymethyl-phenyl)-14-(5-methyl-indol-1-ylmethyl)-8,17,20-trioxo-7,16,19-triaza-spiro[5.14]icos-11-en-9-yl]-acetic acid