You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 7-[[(2Z)-2-(5-amino-1,2,4-thiadiazol-3-yl)-2-(2-carboxypropan-2-yloxyimino)acetyl]amino]-8-oxo-3-[(1,4,6-triaminopyrimidin-1-ium-2-yl)sulfanylmethyl]-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylate by IUPAC nomenclature, provide its molecular formula.
user
C20H23N11O7S3
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