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organic compounds
X-ray studies of 6,7-dihydroxy-1-phenyl-1,2,3,4-tetrahydroisoquinolinium chloride hydrate (C15H16NO2+.Cl−.H2O), 6,7-dihydroxy-1-(2-methoxyphenyl)-1,2,3,4-tetrahydroisoquinolinium chloride (C16H18NO3+.Cl−) and 6,7-dihydroxy-1-(4-nitrophenyl)-1,2,3,4-tetrahydroisoquinolinium chloride (C15H15N2O4+.Cl−) show that the saturated parts of the rings have deformed half-chair conformations, with equatorially attached phenyl rings. All three structures are ionic, and hydrogen bonds are observed.