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Oxacillin Impurity G Oxacillin Impurity 21 Oxacillin EP Impurity G Oxacillin sodium Impurity 12 Oxacillin Sodium Impurity G(EP) (2S,5R,6R)-6-(3-(3-chlorophenyl)-5-methylisoxazole-4-carboxamido)-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid (2S,5R,6R)-6-(3-(2-chlorophenyl)-5-methylisoxazole-4-carboxamido)-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid compound with (2S,5R,6R)-6-(3-(3-chlorophenyl)-5-methylisoxazole-4-carboxamido)-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid