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 (6R)-7-[[(2E)-2-(2-amino-1,3-thiazol-4-yl)-2-[(4-fluorophenyl)methoxyimino]acetyl]amino]-8-oxo-3-(2H-tetrazol-5-ylsulfanylmethyl)-5-thia-1-azabicyclo[4.2.0]octane-3-carboxylic acid is given. What is its corresponding molecular formula?
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C21H20FN9O5S3
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