Therefore, zeaxanthin has only three stereoisomeric forms.
2.
Malic acid has two stereoisomeric forms ( L-and D-enantiomers ), though only the L-isomer exists naturally.
3.
The ocimenes are monoterpenes found within a variety of plants and fruits . ?-Ocimene and the two ?-ocimenes differ in the position of the isolated double bond : it is terminal in the alpha isomer . ?-Ocimene is " cis-" 3, 7-dimethyl-1, 3, 7-octatriene . ?-Ocimene is " trans-" 3, 7-dimethyl-1, 3, 6-octatriene . ?-Ocimene exists in two stereoisomeric forms, " cis " and " trans, " with respect to the central double bond.