You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the molecular formula of the molecule identified by 6-chloro-N-[(1S,3S)-3-[2-(3-chlorophenyl)ethynyl]-3-hydroxycyclohexyl]pyridine-2-carboxamide ?
user
C20H18Cl2N2O2
assistant