7-epi-Cefixime (Cefixime EP Impurity C)

• CAT Number: R057237
• CAS Number: 108691-83-4
• Molecular Formula: C16H15N5O7S2
• Molecular Weight: 453.444
• Purity: ≥95%
• Synonyms: (6R,7S)-7-[[(2Z)-2-(2-Amino-4-thiazolyl)-2-[(carboxymethoxy)imino]acetyl]amino]-3-ethenyl-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic Acid; Cefixime 7-Epimer; [6R-[6α,7α(Z)]]-7-[[(2-Amino-4-thiazolyl)[(carboxymethoxy)imino]acetyl]amino]-3-
• Storage: -20°C
• IUPAC Name: (6R,7S)-7-[[(2Z)-2-(2-amino-1,3-thiazol-4-yl)-2-(carboxymethoxyimino)acetyl]amino]-3-ethenyl-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid
• InChI: InChI=1S/C16H15N5O7S2/c1-2-6-4-29-14-10(13(25)21(14)11(6)15(26)27)19-12(24)9(20-28-3-8(22)23)7-5-30-16(17)18-7/h2,5,10,14H,1,3-4H2,(H2,17,18)(H,19,24)(H,22,23)(H,26,27)/b20-9-/t10-,14+/m0/s1
• InChIKey: OKBVVJOGVLARMR-WVIRHPHLSA-N
• SMILES: C=CC1=C(N2C(C(C2=O)NC(=O)C(=NOCC(=O)O)C3=CSC(=N3)N)SC1)C(=O)O

7-epi-Cefixime, known as Cefixime EP Impurity C, is an epimer of cefixime, which is a third-generation cephalosporin antibiotic. This impurity features a slight modification in the stereochemistry at the 7th carbon position compared to the parent compound. Like other impurities, 7-epi-Cefixime is identified and quantified during the quality control stages of pharmaceutical production to ensure drug purity and effectiveness.