cas no: 15686-71-2(cephalexin monohydrate cas no:23325-78-2)||chemical formula:c16h17n3o4s||molecular weight:347.38900||exact mass:347.09398||}(6r,7r)-7-[(r)-2-amino-2-phenylacetamido]-3-methyl-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid
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