1-Piperazinecarbothioic acid, 4-(2-pyridinyl)-, {[1-(2-pyridinyl)butylidene]hydrazide} 4-(2-Pyridinyl)-N'-(1-(2-pyridinyl)butylidene)-1-piperazinecarbothiohydrazide 86919-64-4 AIDS-129199 AIDS129199 NSC335794