Flucloxacillin BP Impurity A ; Flucloxacillin Penilloic Acid ; (4S)-2-[Carboxy[[[3-(2-chloro-6-fluorophenyl)-5-methylisoxazol-4-yl]carbonyl]amino]methyl]-5,5-dimethylthiazolidine-4-carboxylic acid ;

Flucloxacillin BP Impurity B ; Flucloxacillin Penilloic Acid (Mixture of Diastereomers) ; (4S)-2-[Carboxy[[[3-(2-chloro-6-fluorophenyl)-5-methyl-4-lisoxazolyl]carbonyl]amino]methyl]-5,5-dimethylthiazolidine-4-carboxylic acid ; CAS # 1276016-89-7 ;

Flucloxacillin BP Impurity C ; 6-Aminopenicillanic Acid (6-APA) ; (2S,5R,6R)-6-Amino-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid ; CAS # 551-16-6 ;

Flucloxacillin BP Impurity D ; 3-(2-Chloro-6-fluorophenyl)-5-methylisoxazole-4-carboxylic acid ; CAS # 3919-74-2 ;

Flucloxacillin BP Impurity E ; 6-APA Flucloxacillin ; (2S,5R,6R)-6-[[[(2S,5R,6R)-6-[[[3-(2-chloro-6-fluorophenyl)-5-methylisoxazol-4-yl]carbonyl]amino]-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]hept-2-yl]carbonyl]amino]-3,3-dimethyl-7-oxo-4-thia-1-azab

(2S,5R,6R)-6-[[[3-(2-Chloro-6-fluorophenyl)-5-methyl-4-isoxazolyl]carbonyl]amino]-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid sodium ; CAS # 1847-24-1 (sodium salt) ; 5250-39-5 (acid) ;