IUPAC Name: N-[(2S)-4-amino-1-[[(2S,3R)-1-[[(2S)-4-amino-1-oxo-1-[[(3S,6S,9S,12S,15R,18S,21S)-6,9,18-tris(2-aminoethyl)-3-[(1R)-1-hydroxyethyl]-12,15-bis(2-methylpropyl)-2,5,8,11,14,17,20-heptaoxo-1,4,7,10,13,16,19-heptazacyclotricos-21-yl]amino]butan-2-yl]amino]-3-h
EC Number: 215-034-3
Molecular Weight: 2493.1
Chemical Formula: C₁₀₅H₂₀₆N₃₂O₃₂S₂
CAS Number: 1264-72-8

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Colistin sulphate (CAS 1264-72-8, molecular formula C52H98N16O13·H2SO4) is a polymyxin-class antibiotic derived from Bacillus polymyxa that disrupts Gram-negative bacterial cell membranes. It is used as a veterinary feed additive and therapeutic for livestock, poultry, and aquaculture infections such as E. coli and Salmonella, and in human medicine as a last-resort treatment for multidrug-resistant infections including Pseudomonas aeruginosa and Acinetobacter baumannii; the WHO classifies it as a Critically Important Antimicrobial, and its use is regulated with enforced withdrawal periods in animals. Supplied by Ningbo Pangs Chem rather than manufactured in-house, with samples available, it is distributed to markets across North America, Europe, Australasia, the Middle East, and Africa; storage at 2-8°C, away from light, is recommended.