You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(4R)-2-cyclopropyl-9-[(3,5-dimethyl-1,2-oxazol-4-yl)methyl]-4-phenyl-2,9-diazaspiro[5.5]undecan-3-one is the IUPAC name of a molecule. Please give its molecular formula.
user
C24H31N3O2
assistant