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An Introduction to Medicinal Chemistry

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198 <strong>An</strong>tibacterial agents<br />

L-LEU — L-DAB<br />

/ \<br />

D-PHE<br />

L-DAB<br />

L-DAB<br />

L-DAB<br />

L-DAB<br />

L-THR<br />

POLYMYXIN B<br />

L-DAB<br />

C=0<br />

I<br />

(CH 2) 4<br />

CH-CH 3<br />

Fig. 10.69 Polypeptide antibiotic. CH 2 CH 3<br />

such as nucleosides from the cell. The drug is injected intramuscularly and is useful<br />

against Pseudomonas strains which are resistant <strong>to</strong> other antibacterial agents.<br />

10.7 <strong>An</strong>tibacterial agents which impair protein synthesis<br />

Examples of such agents are the rifamycins which act against RNA, and the aminoglycosides,<br />

tetracyclines, and chloramphenicol which all act against the ribosomes.<br />

Selective <strong>to</strong>xicity

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