You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
6,15-dimethyl-5-(2,3,5-trimethylphenyl)-6-azoniapentacyclo[11.7.0.02,10.04,9.014,19]icosa-1(13),2(10),4(9),5,7,11,14,16,18-nonaene;6,16-dimethyl-5-(2,3,5-trimethylphenyl)-6-azoniapentacyclo[11.7.0.02,10.04,9.014,19]icosa-1(13),2(10),4(9),5,7,11,14(19),15,17-nonaene;6,17-dimethyl-5-(2,3,5-trimethylphenyl)-6-azoniapentacyclo[11.7.0.02,10.04,9.014,19]icosa-1(13),2(10),4(9),5,7,11,14(19),15,17-nonaene;6,18-dimethyl-5-(2,3,5-trimethylphenyl)-6-azoniapentacyclo[11.7.0.02,10.04,9.014,19]icosa-1(13),2(10),4(9),5,7,11,14,16,18-nonaene is the IUPAC name of a molecule. Please give its molecular formula.
user
C120H112N4+4
assistant