5,11-Dimethyl-6H-pyrido(4,3-b)carbazole tartrate 519-23-3 55042-50-7 6H-Pyrido(4,3-b)carbazole, 5,11-dimethyl-, (R-(R*,R*))-2,3-dihydroxybutanedioate (1:1) 6H-Pyrido(4,3-b)carbazole, 5,11-dimethyl-, tartrate Ellipticine tartrate ICIG 719A