You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[1-(4-chlorophenyl)-2-(cyclohexylamino)-2-oxoethyl]-3-(3-methoxyphenyl)-N-(4-propan-2-ylphenyl)propanamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C33H39ClN2O3
assistant