摘要:
An amino acid derivative of the formula: in which R¹ is hydrogen, lower alkyl, halo(lower)alkyl or aryl R² is hydrogen, hydroxy or protected hydroxy, R³ is hydrogen, R⁴ is lower alkyl, amino(lower)alkyl, carboxy(lower)alkyl, aminocarboxy(lower)alkyl, protected amino(lower)alkyl or protected amino-carboxy(lower)alkyl, R⁵ is hydrogen or lower alkyl, and R² and R³ may combine to be oxo, and its pharmaceutical acceptable salt, having anti-tumor activity a process for preparation thereof and pharmaceutical compositions comprising the same.
摘要:
An amino acid derivative of the formula: in which R¹ is hydrogen, lower alkyl, halo(lower)alkyl or aryl R² is hydrogen, hydroxy or protected hydroxy, R³ is hydrogen, R⁴ is lower alkyl, amino(lower)alkyl, carboxy(lower)alkyl, aminocarboxy(lower)alkyl, protected amino(lower)alkyl or protected amino-carboxy(lower)alkyl, R⁵ is hydrogen or lower alkyl, and R² and R³ may combine to be oxo, and its pharmaceutical acceptable salt, having anti-tumor activity a process for preparation thereof and pharmaceutical compositions comprising the same.