The present invention provides a process for the preparation of a compound of formula (VI), or a salt or derivative thereof,
wherein R1 and R2 are independently C1-8 alkyl and * represents a stereocentre.
本发明提供了一种制备式(VI)化合物或其盐或衍
生物的工艺、
其中 R1 和 R2 独立地为 C1-8 烷基,* 代表立体中心。