has role fatty acid 20:4 long-chain fatty acid icosatetraenoic acid PMID:23475189 20:4 icosatetraenoic acid 0 CHEBI:36033 eicosatetraenoic acids eicosatetraenoic acid 304.24023 OC([*])=O C20:4 icosatetraenoic acids A 20-carbon, polyunsaturated fatty acid having four double bonds at unspecified positions. C20H32O2 304.46690 chebi_ontology olefinic fatty acid icosatetraenoate human metabolite Caenorhabditis elegans metabolite