1-Phenyl-2-thio-4,4,6-trimethyl dihydropyrimidine 16325-43-2 2(1H)-Pyrimidinethione, 3,4-dihydro-4,4,6-trimethyl-1-phenyl- 3,4-Dihydro-1-phenyl-4,4,6-trimethyl-2(1H)-pyrimidinethione AI3-24609 NSC 32276 USAF K-1796