antimycin /(ăn`tĭ*mī"sĭn)/

an·ti·my·cin

antimycin

n.
  1. one of several antibiotic substances produced by several species of Streptomyces, active against various fungi. They are used only experimentally, not in medicine. The two best-known antimycins are antimycin A1 (C28H40N2O9) and antimycin A3 (C26H36N2O9). They are notable for their mechanism of action, interference with the proton pumping mechanism of fungi.