You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
ethyl 5-[4-(dimethylamino)cyclohexyl]-7-methyl-3,5,6,7,8,8a-hexahydro-2H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate The above is the IUPAC name of a molecule. Write its molecular formula.
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C18H33N3O2S
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