N-[4-[1-[(2,6-Difluorophenyl)methyl]-5-[(dimethylamino)methyl]-1,2,3,4-tetrahydro-3-(6-methoxy-3-pyridazinyl)-2,4-dioxothieno[2,3-d]pyrimidin-6-yl]phenyl]-N'-methoxyurea

N-[4-[1-[(2,6-Difluorophenyl)methyl]-5-[(dimethylamino)methyl]-1,2,3,4-tetrahydro-3-(6-methoxy-3-pyridazinyl)-2,4-dioxothieno[2,3-d]pyrimidin-6-yl]phenyl]-N'-methoxyurea