You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule (10bR)-1'-methyl-2-(4-phenylphenyl)spiro[3,10b-dihydropyrazolo[1,5-c][1,3]benzoxazine-5,4'-piperidin-1-ium] into molecular formula.
user
C27H28N3O+
assistant