You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule N-[[1-(dimethylamino)-2-methylpropan-2-yl]carbamoyl]-N-ethyl-1'-methylspiro[1,3-dioxolane-2,6'-2,3,4,4a,5,7,8,8a-octahydroquinoline]-3'-carboxamide .
user
C22H40N4O4
assistant