Process for production of crystals of 11mu-benzaldoxim-estra-4,9-diene derivatives, crystals obtained thereby and pharmaceutical preparations containing them

摘要

The process for making crystals of a 11 beta-benzaldoxim-estra-4,9-diene derivative having an average particle size of from 3 mum to 25 mum and a maximum particle size of 100 mum, includes subjecting a supersaturated solution containing a special 11beta-benzaldoxim-estra-4,9-diene derivative of formula (I) to a wet milling by a wet milling apparatus while crystallizing, In order to obtain a primary particle suspension. Crystals obtained according to this process and pharmaceutical preparations containing them are also described and are part of the invention.