2-(5-(4-Chlorophenyl)-3-mesityl-4-isoxazolyl)-1,4,5,6-tetrahydropyrimidine 3-(2,4,6-Trimethylphenyl)-4-(2-tetrahydropyrimidinyl)-5- (4-chlorophenyl)-isooxazole AIDS-138369 AIDS138369 NSC645052