You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named (1S,5S,6S,8S,10R,16S)-11-ethyl-6-methoxy-13-methyl-11-azahexacyclo[7.7.2.12,5.01,10.03,8.013,17]nonadecane-4,8,16-triol by IUPAC nomenclature, provide its molecular formula.
user
C22H35NO4
assistant