Invention Grant
US09481681B2 Dihydroetorphines and their preparation 有权
二氢吗啡及其制备

Dihydroetorphines and their preparation
Abstract:
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.
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