5-chloro-1-(piperidinomethyl)-3[3'-(4''-pyridyl)-5'-mercapto-1',2',4'-triazol-2'-yl]iminoisatin 5-chloro-1-(piperidinomethyl)-3[3'-(4-pyridyl)-5'-mercapto-1',2',4'-triazol-2'-yl]iminoisatin AIDS-064189 AIDS064189