You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name 4-butan-2-ylsulfanyl-1-methyl-3-propan-2-yl-5-[(pyridin-4-ylmethylamino)methyl]imidazol-2-one into its molecular formula.
user
C18H28N4OS
assistant