You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-methyl-4-(pyridin-3-ylmethyl)-9-(3-pyrimidin-5-ylpropanoyl)-1,4,9-triazaspiro[5.5]undecan-5-one is the IUPAC name of a molecule. Please give its molecular formula.
user
C22H28N6O2
assistant