2(1H)-Pyrimidinethione, 3,4-dihydro-4,4,6-trimethyl- 2-Pyrimidinethiol, 1,4-dihydro-4,4,6-trimethyl- 2-Thio-4,4,6-trimethyl dihydropyrimidine 5392-23-4 NSC3270 Usaf k-1795