1,2,3,4-Tetrahydro-2-methylisoquinoline 1612-65-3 2-Methyl-1,2,3,4-tetrahydroisoquinoline 5-20-06-00321 (Beilstein Handbook Reference) 53112-33-7 BRN 0127214 ISOQUINOLINE, 1,2,3,4-TETRAHYDRO-2-METHYL-