Wiktionary
diadinoxanthin
n. (context organic compound English) A pigment found in phytoplankton, with chemical formula C40H54O3.
Wikipedia
Diadinoxanthin
Diadinoxanthin is a pigment found in a type of plankton. It has the formula CHO. It gives rise to the xanthophylls diatoxanthin and dinoxanthin.