β-Eleostearic acid, or-octadeca-9,11,13-trienoic acid, is an organic compound with formula C ₁₈H ₃₀O ₂ or H₃C(CH₂)₃(CH=CH)₃(CH₂)₇COOH. It is an all-trans isomer of octadecatrienoic acid. Wikipedia