You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Under IUPAC nomenclature, a molecule named (2S)-2-[[2-(7-hydroxy-4,8-dimethyl-2-oxochromen-3-yl)acetyl]amino]-2-phenylacetic acid is given. What is its corresponding molecular formula?
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C21H19NO6
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