You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
5-[3-(3-chlorophenyl)-1,2,4-oxadiazol-5-yl]-6-(4-ethylphenyl)-3-(furan-2-ylmethyl)-4-methyl-1,6-dihydropyrimidin-2-one is the IUPAC name of a molecule. Please give its molecular formula.
user
C26H23ClN4O3
assistant