1-(3-aminophenyl)-3-cyclopropyl-5-((2-fluoro-4-iodophenyl)amino)-6,8-dimethylpyr ido[4,3-d]pyrimidine-2,4,7(1H,3H,6H)-trione-14C,1-(3-aminophenyl)-3-cyclopropyl-5-((2-fluoro-4-iodophenyl)amino)-6,8-dimethylpyr ido[4,3-d]pyrimidine-2,4,7(1H,3H,6H)-trione-14C,Trametinib