CRYSTALLINE 6,7-UNSATURATED-7-CARBAMOYL MORPHINANE DERIVATIVE, AND METHOD FOR PRODUCING SAME

摘要

Stable crystalline forms of a compound represented by the formula (IA):
, an acid addition salt, and/or a solvate thereof are provided by the present invention. Said crystalline forms are extremely useful as materials for preparing medicines. Novel processes for preparing 6,7-unsaturated-7-carbamoyl morphinan derivatives are also provided by the present invention.