You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(1S,2S)-13-aza-11-azoniapentacyclo[11.8.0.02,11.05,10.014,19]henicosa-5,7,9,11,14,16,18-heptaene is the IUPAC name of a molecule. Please give its molecular formula.
user
C19H19N2+
assistant