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