receptor binding studies showed that tiqs could be classified as having ( a ) higher affinity for opiate receptors ( tetrahydropapaverine , papaverine , 6-methylsalolinol , 1-carboxysalsolinol and 3',4'-deoxy-norlaudanosolinecarboxylic acid ) , ( b ) higher affinity for the dopamine receptor ( salsolinol and 7-methylsalsolinol ) , or ( c ) approximately equal affinity for the two binding sites ( 6,7-dimethylsalsolinol and tetrahydropapaveroline , thp ) .
C0030350
papaverine
C0039674
tetrahydropapaveroline