CHEMICAL PROCESS AND NEW CRYSTALLINE FORM

摘要

The present invention relates to the preparation of a &bgr;2 adrenergic agonist in crystalline salt form. In particular the invention relates to preparation of a crystalline salt of compound (I) in particular a crystalline monohydrochloride salt. The invention also relates to a new crystalline form (polymorph) of the monohydrochloride salt of compound (Ia) and a process for preparing it.