You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-[4-(2-methylpiperidin-1-yl)-6-morpholin-4-ylpyrimidin-2-yl]-3-(pyridin-3-ylmethyl)thiourea The above is the IUPAC name of a molecule. Write its molecular formula.
user
C21H29N7OS
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