1-Piperazinethiocarboxylic acid, 4-(2-propynyl)- {2-[1-(2-pyridinyl)ethylidene]hydrazide} 4-(2-Propynyl)-N'-(1-(2-pyridinyl)ethylidene)-1-piperazinecarbothiohydrazide AIDS-130054 AIDS130054 NSC376266