You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-(2,2-dimethyloxan-4-yl)-N-ethyl-2-(2-methyl-1,3-thiazol-4-yl)-6-oxo-1H-pyrimidine-5-carboxamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C18H24N4O3S
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