1,2,3-Thiadiazole-4-carboxylic acid, 5,5',5''-[(2,4,6-trioxo-1,3,5-triazine-1,3,5(2H,4H,6H)-triyl)tris(6,1-hexanediyliminocarbonylimino)]tris-, triethyl ester AIDS-051589 AIDS051589 NSC684034