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Name the molecular formula for the molecule established as (2R,5R,6R)-3,3-dimethyl-6-[(2-methyl-6-phenylpyrimidin-4-yl)amino]-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid using the IUPAC nomenclature.
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C19H20N4O3S
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