You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named [1-[(4-chlorophenyl)methyl]-5-methoxy-2-methylindol-3-yl]-(3-pyridin-3-yl-1,2-thiazol-5-yl)methanone by IUPAC nomenclature, provide its molecular formula.
user
C26H20ClN3O2S
assistant