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 2-amino-N-[2-[[(2S)-2-aminopropanoyl]amino]acetyl]-N-[(2S)-4-methyl-1-oxopentan-2-yl]benzamide is given. What is its corresponding molecular formula?
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C18H26N4O4
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