139233-51-5 3,4-Dphmtq 4-(3,4-Dihydroxyphenyl)-7-hydroxy-8-methyl-1,2,3,4-tetrahydroisoquinoline Isoquinoline, 4-(3,4-dihydroxyphenyl)-7-hydroxy-8-methyl-1,2,3,4-tetrahydro-