You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
acetylene;4-[(4-chloropyridin-2-yl)methoxy]-1-[[4-(2-cyclopropylethynyl)phenyl]methyl]-6-methylpyridin-2-one is the IUPAC name of a molecule. Please give its molecular formula.
user
C26H23ClN2O2
assistant