You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3-[2-(2-methylpropyl)-6,7-dihydro-4H-[1,3]thiazolo[5,4-c]pyridin-5-yl]propanoic acid is the IUPAC name of a molecule. Please give its molecular formula.
user
C13H20N2O2S
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