You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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For the molecule named 2-chloro-4-[[4-[[(1S)-2-hydroxy-1-phenylethyl]amino]-5-(5-methyl-1,3-oxazol-2-yl)pyrimidin-2-yl]amino]benzamide by IUPAC nomenclature, provide its molecular formula.
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C23H21ClN6O3
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