6-Chloro-3-((4Z)-6,8-dichloro-3-methyl-4-{[(4-methylphenyl)sulfonyl]hydrazono}-4H-benzopyran-2-yl)- 2H-1,2,4-benzothiadiazine-7-sulfonamide 1,1-dioxide AIDS-138929 AIDS138929 NSC646778