You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[4-[[(6-chloropyrimidin-4-yl)-[(2-methyl-1,3-thiazol-4-yl)methyl]amino]methyl]phenyl]sulfanyl-2-methylpropanoic acid is the IUPAC name of a molecule. Please give its molecular formula.
user
C20H21ClN4O2S2
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