2-Methyl-1,2,3,4-tetrahydroisoquinoline-6,7-diol hydrochloride 37491-98-8 6,7-Dihydroxy-2-methyl-1,2,3,4-tetrahydroisoquinoline hydrochloride 63937-92-8 ISOQUINOLINE-6,7-DIOL, 1,2,3,4-TETRAHYDRO-2-METHYL-, HYDROCHLORIDE Isoquinoline, N-methyl-6,7-dihydroxy-1,2,3,4-tetrahydro-, hydrochloride N-Methyl-6,7-dihydroxy-1,2,3,4-tetrahydroisoquinoline hydrochloride