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Formulas which begin with C₂₃H₂₁N₃O₇S

All formulas are in Hill order.

• C₂₃H₂₁N₃O₇S (5-Thia-1-azabicyclo[4.2.0]oct-3-ene-2-carboxylic acid, 3-methyl-8-oxo-7-(2-phenoxyacetamido)-p-nitrobenzyl ester)
• C₂₃H₂₁N₃O₇S (5-Thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid, 3-methyl-8-oxo-7-[(phenoxyacetyl)amino]-, (4-nitrophenyl) methyl)
• C₂₃H₂₁N₃O₇S (p-Nitrobenzyl 7-(phenoxyacetamido)-3-methylenecepham-4-carboxylate)