10H-Thieno(2,3-b)(1,5)benzodiazepine, 2-ethyl-4-(4-methyl-1-piperazinyl)-, maleate 2-Ethyl-4-(4-methyl-1-piperazinyl)-10H-thieno(2,3-b)(1,5)benzodiazepine maleate 61325-72-2