Synonyms: 2,5-Cyclohexadiene-1,4-dione,2-(3,7,11,15,19,23,27,31,35,39-decamethyl-2,6,10,14,18,22,26,30,34,38-tetracontadecaenyl)-5,6-dimethoxy-3-methyl-,radical ion(1-), (all-E)-; 2,5-Cyclohexadiene-1,4-dione,2-[(2E,6E,10E,14E,18E,22E,26E,30E,34E)-3,7,11,15,19,23,27,31,35,39-decamethyl-2,6,10,14,18,22,26,30,34,38-tetracontadecaenyl]-5,6-dimethoxy-3-methyl-,radical ion(1-) (9CI); p-Benzoquinone, 2-(3,7,11,15,19,23,27,31,35,39-decamethyl-2,6,10,14,18,22,26,30,34,38-tetracontadecaenyl)-5,6-dimethoxy-3-methyl-,radical ion(1-) (8CI); Coenzyme Q10 semiquinone; Ubisemiquinone