Menetelmä lääkeaineina käyttökelpoisten milbemysiinin johdannaisten valmistamiseksi

摘要

The invention relates to a process for producing a derivative of milbemycin which can be used as a drug and which has the formula <IMAGE> where X is H or OH; R<4> denotes a hydrogen atom or an arbitrarily substituted ester-forming carboxyl or carbonic acid radical; R<1> denotes a C1-4-alkyl or C4-8- alkenyl group; R<2> denotes a substituted C1-6-alkyl group. The invention can be used to obtain a preparation directed against worms, mites or insects.