1,4-Dihydro-1-(o-mercaptophenyl)-4,4,6-trimethyl-2-pyrimidinethiol 2(1H)-Pyrimidinethione, 3,4-dihydro-1-(2-mercaptophenyl)-4,4,6-trimethyl- 3,4-Dihydro-1-(2-mercaptophenyl)-4,4,6-trimethyl-2(1H)-pyrimidinethione 63917-27-1