Methadone Hydrochloride Product Name: methadone hydrochloride Synonyms: Methadone Hydrochloride {D.D.}; Methadone HCl; 6-(dimethylamino)-4,4-diphenylheptan-3-one; 6-(dimethylamino)-4,4-diphenylheptan-3-one hydrochloride (1:1); 6-(dimethylamino)-4,4-diphenylheptan-3-one dihydrochloride CAS RN.: 1095-90-5 EINECS: 214-140-7 Molecular Weight: 382.3671 Molecular Formula: C21H29Cl2NO Boiling Point: 477.8°C at 760 mmHg Flash Point: 242.8°C Water Solubility: 120 mg/mL Hazard Symbols: T Risk Codes: R25; Safety Description: S45; MSDS Top of Form