40431-52-5 7,8,9,10,11,12-Hexahydro-10-methylnaphtho(2,1-b)(1,6)naphthyridine hydrochloride NAPHTHO(2,1-b)(1,6)NAPHTHYRIDINE, 7,8,9,10,11,12-HEXAHYDRO-10-METHYL-, HYDROCHLO Naphtho(2,1-b)(1,6)naphthyridine, 7,8,9,10,11,12-hexahydro-10-methyl-, hydrochloride