Ansamycin

Ansamycins is a family of secondary metabolites that show antimicrobial activity against many Gram-positive and some Gram-negative bacteria and includes various compounds, among which: streptovaricins and rifamycins. In addition, these compounds demonstrate antiviral activity towards bacteriophages and poxviruses. ==Structure== They are named ansa...
Found on http://en.wikipedia.org/wiki/Ansamycin

ansamycin

An anticancer drug that belongs to the family of drugs called antineoplastic antibiotics.
Found on http://www.cancer.gov/dictionary?expand=A
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