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. 2003 Nov 25;100(Suppl 2):14555–14561. doi: 10.1073/pnas.1934677100

Fig. 1.

Fig. 1.

Structures of clavulanic acid (1), clavams (R = variable group) (2), and cephamycin C (3), coproduced by several Streptomyces species. 1 and 3 act synergistically to inhibit cell wall biosynthesis in β-lactam-resistant bacteria.