The present invention provides a process for the preparation of a compound of formula (Vl), 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化合物(Vl)或其盐或衍
生物的方法,其中R1和R2分别是独立的C1-8烷基,*代表一个立体中心。