You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-[3-(3,4-dichlorophenyl)-4-[[2-(furan-2-yl)-2-oxoethyl]amino]butyl]-N,N-dimethyl-4-piperidin-1-ylpiperidine-4-carboxamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C29H40Cl2N4O3
assistant