tokens: The therapeutic use of selective DA D1 receptor agonists such as SKF - 82958 ( 6 - chloro - 7 , 8 - dihydroxy - 3 - allyl - 1 - phenyl - 2 , 3 , 4 , 5 - tetrahydro - 1H - 3 - benzaze pine hydrobromide ) and A - 77636 ( [ 1R , 3S ] 3 - [ 1 ' - admantyl ] - 1 - aminomethyl - 3 , 4 - dihydro - 5 , 6 - dihydroxy - 1H - 2 - benzo pyran hydrochloride ) seems limited because of their duration of action , which is too short for SKF - 82958 ( < 1 hr ) and too long for A - 77636 ( > 20 hr , leading to behavioral tolerance ) .