You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3-(3-methoxyphenyl)-N-(2-methylpropyl)-3-(5-methyl-5,6,7,8-tetrahydroimidazo[1,2-a]pyridin-3-yl)propanamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C22H31N3O2
assistant