(2Z,4E)-2-hydroxy-6-oxohexa-2,4-dienoic acid
(2z,4e)-2-hydroxy-6-oxohexa-2,4-dienoic acid
A 2-hydroxy-6-oxohexa-2,4-dienoic acid in which the double bonds at positions 2 and 4 have <i>Z</i>- and <i>E</i>-configuration respectively.