You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name (7R)-2-[(1S)-1-(4-ethylpiperazin-1-yl)ethyl]-7-methyl-5,6,7,8-tetrahydro-3H-[1]benzothiolo[2,3-d]pyrimidin-4-one into its molecular formula.
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C19H28N4OS
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