119694-67-6 2-(9H-Pyrido(3,4-b)indol-3-ylmethylene)hydrazinecarbothioamide BRN 6517987 Hydrazinecarbothioamide, 2-(9H-pyrido(3,4-b)indol-3-ylmethylene)- beta-Carboline-3-carboxaldehyde thiosemicarbazone