tertiary allylic alcohol apo carotenoid sesquiterpenoid abscisic acids abscisic acid (4E)-5-(1-hydroxy-2,6,6-trimethyl-4-oxocyclohex-2-en-1-yl)-3-methylpenta-2,4-dienoic acid (4E)-5-(1-hydroxy-2,6,6-trimethyl-4-oxocyclohex-2-en-1-yl)-3-methylpenta-2,4-dienoic acid Any apo carotenoid sesquiterpenoid that is 3-methylpenta-2,4-dienoic acid substituted at position 5 by a 1-hydroxy-2,6,6-trimethyl-4-oxocyclohex-2-en-1-yl group and in which the acyclic double bond between positions 4 and 5 has <i>E</i>-configuration. abscisates alpha,beta-unsaturated monocarboxylic acid