Propan-2-yl [4-[[2-(methylcarbamoyl)pyridin-4-yl]oxy]phenyl]carbamate; Isopropyl 4-[[2-(N-Methylcarbamoyl)-4-pyridyl]oxy]phenylcarbamate; Isopropyl (4-((2-(Methylcarbamoyl)pyridin-4-yl)oxy)phenyl)carbamate; Phenylcarbamate, Isopropyl 4-[[2-(N-Methylcarbamoyl)-4-pyridyl]oxy]; Sorafenib Carbamate Isopropyl Ester Impurity