The molecule is a 12-HPEPE anion that is the conjugate base of 12(S)-HpEPE arising from deprotonation of the carboxylic acid function; major species at pH 7.3. It is a 12-HPEPE(1-) and a hydroperoxyicosapentaenoate. It derives from an all-cis-5,8,11,14,17-icosapentaenoate. It is a conjugate base of a 12(S)-HpEPE.
(5Z,8Z,10E,12S,14Z,17Z)-12-hydroperoxyicosa-5,8,10,14,17-pentaenoate