2-(Methylthio)-10-(4-methylpiperazino)-10,11-dihydrodibenzo(b,f)thiepin di(hydrogen maleate) 57536-63-7 Piperazine, 1-(10,11-dihydro-2-(methylthio)dibenzo(b,f)thiepin-10-yl)-4-methyl-, (Z)-2-butenedioate (1:2)