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IKD-8344 is a macrocyclic dilactone originally isolated from an actinomycete species and has diverse biological activities, including anticancer, antimicrobial, and anthelmintic properties.1,2,3 It is cytotoxic to L5178Y murine leukemia cells (IC50 = 0.54 ng/ml).1 IKD-8344 inhibits growth of the mycelial form of C. albicans (MIC = 6.25 μg/ml) and potentiates the activity of polymyxin B against the multidrug-resistant pathogenic bacterium B. cenocepacia.2,3 It is active against T. spiralis in vitro and in vivo.1

|1. Minami, Y., Yoshida, K., Azuma, R., et al. Structure of a novel macrodiolide antibiotic IKD-8344. Tetrahedron Lett. 33(48), 7373-7376 (1992).|2. Hwang, E.I., Yun, B.S., Yeo, W.H., et al. Compound IKD-8344, a selective growth inhibitor against the mycelial form of Candida albicans, isolated from Streptomyces sp. A6792. J. Microbiol. Biotechnol. 15(4), 909-912 (2005).|3. Loutet, S.A., El-Halfawy, O.M., Jassem, A.N., et al. Identification of synergists that potentiate the action of polymyxin B against Burkholderia cenocepacia. Int. J. Antimicrob. Agents 46(4), 376-380 (2015)..
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