1-(2-methyl-3-hydroxy-5-hydroxymethyl-4-pyridyl)-6,7-dihydroxy-1,2-3,4-tetrahydroisoquinoline;1-(3-Hydroxy-5-hydroxymethyl-2-methyl-4-pyridinyl)-1,2,3,4-tetrahydroisoquinoline-6,7-diol;PTIQ
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