You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named [4-di(propan-2-yl)phosphanyl-8,8,9-triethyl-9H-isoquinolino[1,2-a]isoquinolin-7-ium-12-yl]-di(propan-2-yl)phosphane by IUPAC nomenclature, provide its molecular formula.
user
C35H52NP2+
assistant