The present invention is concerned with a compound of formula (Ap) or a pharmaceutically acceptable salt thereof,
wherein P1 represents a hydroxy protecting group and P3 represents an amino protecting group. The present invention is also related to a process for preparing a compound of formula (I) or any pharmaceutically acceptable salt thereof, via a novel intermediate compound (Ap).
本发明涉及一种公式(Ap)的化合物或其药用盐,其中P1代表一个羟基保护基团,P3代表一个
氨基保护基团。本发明还涉及通过一种新颖的中间化合物(Ap)制备公式(I)的化合物或其任何药用盐的方法。