You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name (1S,2S,3R)-2-[(1S)-1-acetamido-2-ethylbutyl]-3-(diaminomethylideneamino)-1-hydroxycyclopentane-1-carboxylic acid into its molecular formula.
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C15H28N4O4
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