Cyclosporin A Acetate

Cyclosporin A Acetate is an acetylated derivative of Cyclosporin A, characterized by an acetate ester substitution at the N-terminal amino group of the cyclic undecapeptide backbone. This modification introduces a hydrophobic acetyl moiety, altering the parent drug's solubility and metabolic stability. Structurally, it retains the 11-amino acid sequence, including the signature methylated residues and the immunosuppressive tripeptide motif (Ala-Ser-Glu). The compound arises as a synthetic byproduct during acetylation processes or through partial hydrolysis of acetylated intermediates. It serves as a critical HPLC reference standard for quantifying acetylation-related impurities in Cyclosporin A formulations.