发明授权
US06204393B1 Method for crystallizing maleic acid salt of N-(1(S)-ethoxycarbonyl-3-phenylpropyl)-L-alanyl-L-proline 失效
N-(1(S) - 乙氧基羰基-3-苯基丙基)-L-丙氨酰-L-脯氨酸的马来酸盐结晶方法

Method for crystallizing maleic acid salt of N-(1(S)-ethoxycarbonyl-3-phenylpropyl)-L-alanyl-L-proline
摘要:
A process for simply and easily crystallizing a maleate salt of N-(1(S)-ethoxycarbonyl-3-phenylpropyl)-L-alanyl-L-proline (enalapril) having a high quality out of an aqueous liquid, which comprises mixing an aqueous liquid having a pH of not less than 4 and containing N-(1(S)-ethoxycarbonyl-3-phenylpropyl)-L-alanyl-L-proline, maleic acid and a base with an amount of an acid sufficient to convert substantially all the base into a neutral salt.
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