You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-(2-adamantyl)-1-(2-methylperoxyethyl)spiro[1,2-dihydroindene-3,4'-piperidine]-1'-carboxamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C27H38N2O3
assistant