Urea,N-[4-[1-[(2,6-difluorophenyl)methyl]-5-[[(2-ethoxyethyl)methylamino]methyl]-1,2,3,4-tetrahydro-3-(3-hydroxy-6-methyl-2-pyridinyl)-2,4-dioxothieno[2,3-d]pyrimidin-6-yl]phenyl]-N'-ethyl-