has role calcium ionophore metabolite polyunsaturated fatty acid very long-chain fatty acid enol cyclic ether ionomycin CHEBI:63954 A very long-chain fatty acid that is docosa-10,16-dienoic acid which is substituted by methyl groups at positions 4, 6, 8, 12, 14, 18 and 20, by hydroxy groups at positions 11, 19 and 21, and by a (2',5-dimethyloctahydro-2,2'-bifuran-5-yl)ethanol group at position 21. An ionophore produced by <em>Streptomyces conglobatus</em>, it is used in research to raise the intracellular level of Ca<small>^2+</small> and as a research tool to understand Ca<small>^2+</small> transport across biological membranes.