pika-ahelaga rasvhapetest, fenüülpropanoididest ja karotinoididest koosnev keemiliselt väga stabiilne biopolümeer tolmuterade ja spooride väliskestas, A major component of the tough outer walls of plant spores and pollen grains. It is chemically very stable, composed of long-chain fatty acids, phenylpropanoids and carotenoids.