You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Can you give the molecular formula of the molecule 4-[2-(2-methylpropylamino)-2-oxoethyl]-N-propan-2-yl-1-oxa-9-azaspiro[5.5]undecane-9-carboxamide ?
user
C19H35N3O3
assistant