2-Methyl-1,2,3,4-tetrahydroisoquinoline-5,6-diol hydrochloride 5,6-Dihydroxy-2-methyl-1,2,3,4-tetrahydroisoquinoline hydrochloride 63937-91-7 ISOQUINOLINE-5,6-DIOL, 1,2,3,4-TETRAHYDRO-2-METHYL-, HYDROCHLORIDE Isoquinoline, N-methyl-5,6-dihydroxy-1,2,3,4-tetrahydro-, hydrochloride N-Methyl-5,6-dihydroxy-1,2,3,4-tetrahydroisoquinoline hydrochloride