You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule (4S,5R,6S)-1-(heptoxycarbonyloxymethyl)-6-[(1R)-1-hydroxyethyl]-4-methyl-3-(7-methylsulfonylimidazo[5,1-b][1,3]thiazol-2-yl)-7-oxo-1-azoniabicyclo[3.2.0]hept-2-ene-2-carboxylic acid into molecular formula.
user
C25H34N3O9S2+
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