plastoquinone-9

plas·to·quin·one-·9 (PQ-9),

, plastoquinone E9 (plas'tō-kwin'ōn),
2,3-Dimethyl-6-nonaprenyl-1,4-benzoquinone; one of a group of vitamins E and K and coenzymes Q; the isomeric form is plastochromenol-8; a participant in photosynthetic electron transport.