4.2.1.80 60.5 - 2-hydroxyhexa-2,4-dienoate activated by Mg2+ 661714 4.2.1.80 215 - 2-hydroxypent-2,4-dienoate activated by Mn2+ 661714 4.2.1.80 361 - 2-hydroxypent-2,4-dienoate activated by Mg2+ 661714 4.2.1.80 7.7 - 5-chloro-2-hydroxypent-2,4-dienoate activated by Mg2+ 661714