5.3.3.13 (5Z,8Z,11Z,14Z,17Z)-icosapentaenoate = (5Z,7E,9E,14Z,17Z)-icosapentaenoate - - 5.3.3.13 (5Z,8Z,11Z,14Z,17Z)-icosapentaenoate = (5Z,7E,9E,14Z,17Z)-icosapentaenoate mechansim of hydrogen transfers in the isomerization reaction including a diene intermediate 649078 5.3.3.13 (5Z,8Z,11Z,14Z,17Z)-icosapentaenoate = (5Z,7E,9E,14Z,17Z)-icosapentaenoate regio- and stereochemistry of the isomerization reaction, mechanism 649076