You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the molecular formula of the compound with this IUPAC name 5,7-dimethyl-2-(1-methylindol-3-yl)-1,3-diazoniatricyclo[3.3.1.13,7]decan-6-one ?
user
C19H25N3O+2
assistant