Orthorhombic polymorph of (6,7-dimethoxy-1,2,3,4-tetrahydroisoquinolin-1-yl)methanol

The asymmetric unit of the title compound, C12H17NO3, contains two molecules with different conformations. It is a polymorph of the monoclinic form [El Antri et al. (2004). Molecules, 9, 650–657]; the samples were crystallized at different temperatures from the same solvent. In both structures, molecules are linked by O—H...N hydrogen bonds, forming chains. The conformations of the chains and their packing differ markedly in the two polymorphs.