. . . . . . "1-[(3,4-dihydroxyphenyl)methyl]-1,2,3,4-tetrahydroisoquinoline-6,7-diol" . . . . . "tetrahydropapaveroline" . . . . "Norlaudanosoline; Tetrahydroxypapaveroline" . . "Tetrahydropapaveroline" . "(''S'')-norlaudanosoline" . . . "Tetrahydropapaveroline" . . .