You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-N-[(2,6-dichlorophenyl)methyl]-3-N-[4-(1,3-thiazol-2-yl)pyrimidin-2-yl]benzene-1,3-diamine is the IUPAC name of a molecule. Please give its molecular formula.
user
C20H15Cl2N5S
assistant