You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
methyl 2-(5-chloro-1-benzothiophen-2-yl)-2-(3-cyano-6-phenoxypyridin-2-yl)-3-methylbutanoate is the IUPAC name of a molecule. Please give its molecular formula.
user
C26H21ClN2O3S
assistant