1-Azafluorenone tosylhydrazone 110576-17-5 4-Methylbenzenesulfonic acid (9H-indeno(2,1-b)pyridin-9-ylidene)hydrazide BRN 5611613 Benzenesulfonic acid, 4-methyl-, (9H-indeno(2,1-b)pyridin-9-ylidene)hydrazide