2-amino (or hydroxy) phenethyl-1,2,3,4-tetrahydroisoquinolines as analgesics
Analgesic 1,2,3,4-tetrahydroisoquinolines of the formula (1) STR1 wherein R1 and R2 respectively are hydrogen, hydroxy or alkoxy of 1 to 4 carbon atoms, R3 and R4 respectively are hydrogen or alkyl of 1 to 4 car