You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-[(2R,3S)-3-hydroxy-1-naphthalen-2-ylsulfanylbutan-2-yl]imidazole-4-carboxamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C18H19N3O2S
assistant