You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named (9S,12S)-3-(1-benzylpiperidin-4-yl)-9,12-bis(2-methylpropyl)-14-oxa-3,8,11-triazaspiro[5.13]nonadecane-7,10-dione by IUPAC nomenclature, provide its molecular formula.
user
C35H58N4O3
assistant