Pharmaceutical IntermediateChina High Quality API Pharmaceutical Intermediate Pure Promethazine HCl CAS 58-33-3 Promethazine Hydrochlorine Powder for Hot Sale, Find details about China Promethazine Hydrochlorine, Promethazine Hydrochlorine Powder from High Quality API Pharmaceutical Intermediate Pure Promethazine HCl CAS 58-33-3 Promethazine Hydrochlorine Powder for Hot Sale