3-Chloro-5-(chloro((4-methylphenyl)sulfonyl)methyl)-6-phenyl-2,5-dihydro-1,2,4-triazine AIDS-153669 AIDS153669 Chloro(3-chloro-6-phenyl-2,5-dihydro-1,2,4-triazin-5-yl)methyl 4-methylphenyl sulfone NSC701731