You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
4-[1-[(3,5-dichlorophenyl)methyl]-5-methylpyrrol-2-yl]-2-(4-methoxyphenyl)-1,3-thiazole is the IUPAC name of a molecule. Please give its molecular formula.
user
C22H18Cl2N2OS
assistant