4-Methyl-10-(4-methyl-1-piperazinyl)-4H-thieno(3,4-b)(1,5)benzodiazepine dihydrochloride 4H-Thieno(3,4-b)(1,5)benzodiazepine, 4-methyl-10-(4-methyl-1-piperazinyl)-, dihydrochloride 74137-79-4