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

摘要

The present invention provides a compound represented by Formula (IA): an acid addition salt thereof, and/or stable crystals of solvates thereof. The crystals are extremely useful as an active ingredient for producing pharmaceutical products. The present invention further provides a novel method for producing a 6,7-unsaturated-7-carbamoyl morphinane derivative.