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Chemical structures of selected aminoglycoside antibiotics. For gentamicin C1: R1 = R2 = CH3; gentamicin C2: R1 = CH3, R2 = H; and gentamicin C1A: R1 = R2 = H. For kanamycin A: R1 = NH2, R2 = OH; kanamycin B: R1 = R2 = NH2; and kanamycin C: R1 = OH, R2 = NH2.
