You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named (1R,5S,6S)-3-[(1-methylpyrazol-4-yl)methyl]-N-phenyl-8-oxa-3-azabicyclo[3.2.1]octane-6-carboxamide by IUPAC nomenclature, provide its molecular formula.
user
C18H22N4O2
assistant