You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[1-[(pyridine-3-carbonylamino)methyl]cyclohexyl] 4-[4-[bis(2-chloroethyl)amino]phenyl]butanoate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C27H35Cl2N3O3
assistant