You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Convert the IUPAC name of a molecule (2S,3R)-3-methyl-2-[[(2S)-4-methyl-2-[(3-oxo-2,4-dihydroquinoxaline-1-carbonyl)amino]pentanoyl]amino]pentanoate into molecular formula.
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C21H29N4O5-
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