You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule (6S)-7-[(2-aminoacetyl)-naphthalen-2-ylamino]-3-(methoxymethyl)-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid into molecular formula.
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C21H21N3O5S
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