121282-86-8 4-(N(sup 2)-Isobutylidenehydrazino)-7,8-dimethoxy-5H-pyridazino(4,5-b)indole BRN 5990728 Propanal 2-methyl-, (7,8-dimethoxy-5H-pyridazino(4,5-b)indol-4-yl)hydrazone