4-(Acetyloxy)-retinal is an intermediate used in the synthesis of Echinenone (E325630), which is a protective carotenoid. Echinenone is an analogue of β-Carotene (C184250), the most important of the provitamins A. Widely distributed in the plant and animal kingdom. In plants it occurs almost always together with chlorophyll. Vitamin A precursor. Ultraviolet screen.