You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name [2-[[(2R)-butan-2-yl]carbamoylamino]-2-oxoethyl] 2-[(4S)-4-methyl-4-(4-methylphenyl)-2,5-dioxoimidazolidin-1-yl]acetate into its molecular formula.
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C20H26N4O6
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