?:definition
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The chemical reactions and pathways leading to the formation of ansamycins, any of a group of complex macrolactam compounds characterized by a cyclic structure in which an aliphatic ansa chain forms a bridge between two non-adjacent positions of a cyclic p-system; many exhibit antibacterial, antifungal or antitumor activity. [GOC:mah, http://ww2.icho.edu.pl/cednets/rydzyna/meyer.htm]
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