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system
Provide the molecular formula for the IUPAC named substance (5R)-2-[(2-chlorophenyl)methylsulfanyl]-N-(2-ethylphenyl)-4,7-dioxo-3,5,6,8-tetrahydropyrido[2,3-d]pyrimidine-5-carboxamide .
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C23H21ClN4O3S
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