You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
methyl (1R,9S,10S,12S,13E)-13-ethylidene-18-hydroxy-8-methyl-8,15-diazahexacyclo[14.2.1.01,9.02,7.010,15.012,17]nonadeca-2,4,6-triene-17-carboxylate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C22H26N2O3
assistant