You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
methyl (15S)-7-cyclohexyl-15-formyl-1-azoniapentacyclo[10.7.0.02,4.06,11.014,19]nonadeca-3,5,7,9,11,14(19),17-heptaene-1-carboxylate is the IUPAC name of a molecule. Please give its molecular formula.
user
C27H28NO3+
assistant