You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
6-chloro-N-[2-[2-[[(4E,7E,10E,13E,16E,19E)-docosa-4,7,10,13,16,19-hexaenoyl]amino]ethyl-methylamino]ethyl]pyridine-3-carboxamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C33H47ClN4O2
assistant