You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 2-chloro-4-methoxypyrimidine;1-ethylpyrazol-4-amine;N-(1-ethylpyrazol-4-yl)-4-methoxypyrimidin-2-amine;methanethiol by IUPAC nomenclature, provide its molecular formula.
user
C21H31ClN10O2S
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