You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named (6S,7S)-7-[(2-amino-2-phenylacetyl)amino]-7-methoxy-3-[(1-methyltetrazol-5-yl)sulfanylmethyl]-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid by IUPAC nomenclature, provide its molecular formula.
user
C19H21N7O5S2
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