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The reaction of ethyl chloroformate (2.441 g) with N-t-butoxycarbonylglycine (3.938 g) in methylene chloride under ice cooling gave a solution comprising the mixed acid anhydride, which was reacted with 3-hydrazino-5-methyl-6-phenyl-1,2,4-triazine (3.015 g) in a similar manner to that of Example 17-(1) to give 3-[2-(N-t-butoxycarbonylglycyl)hydrazino]-5-methyl-6-phenyl-1,2,4-triazine (4.068 g). The purification was conducted with column chromatography on silica gel (80 g) using a mixture of methylene chloride and methanol (30:1) as an eluent.

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