You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Can you give the molecular formula of the molecule (4aS,7aR)-4-pyrimidin-2-yl-1-(1,3-thiazol-2-ylmethyl)-2,3,4a,5,7,7a-hexahydrothieno[3,4-b]pyrazine 6,6-dioxide ?
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C14H17N5O2S2
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