You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(3aS,8aS)-2,2-dimethyl-4,4,8,8-tetraphenylspiro[3a,5,7,8a-tetrahydro-[1,3]dioxolo[4,5-d]azepin-6-ium-6,1'-azolidin-1-ium] is the IUPAC name of a molecule. Please give its molecular formula.
user
C37H40NO2+
assistant