has role omega-3 fatty acid all-cis-docosa-4,7,10,13,16,19-hexaenoic acid A docosahexaenoic acid having six cis-double bonds at positions 4, 7, 10, 13, 16 and 19. antineoplastic agent docosahexaenoic acid nutraceutical mouse metabolite (4Z,7Z,10Z,13Z,16Z,19Z)-docosahexaenoate Daphnia tenebrosa metabolite algal metabolite