Any benzoquinone derived from 2,3-dimethoxy-5-methylbenzoquinone; one of a group of naturally occurring homologues. The redox-active quinoid moiety usually carries a polyprenoid side chain at position 6, the number of isoprenoid units in which is species-specific. Ubiquinones are involved in the control of mitochondrial electron transport, and are also potent anti-oxidants.
| Member | Definition | Role |
|---|
| 3,4-dimethoxydalbergione | | (R)-3,4-Dimethoxydalbergione |
| coenzyme q10 | A ubiquinone having a side chain of 10 isoprenoid units. In the naturally occurring isomer, all isoprenyl double bonds are in the E- configuration. | coenzyme Q10 |
| ubiquinone 6 | A ubiquinone compound having a (2E,6E,10E,14E,18E)-3,7,11,15,19,23-hexamethyltetracosa-2,6,10,14,18,22-hexaen-1-yl substituent at position 2. | ubiquinone-6 |
| ubiquinone 7 | A compound whose structure comprises a 2,3-dimethoxy-5-methylbenzoquinone nucleus, common to ubiquinones; and a side chain of seven isoprenoid units. | ubiquinone-7 |
| ubiquinone 8 | A ubiquinone whose structure comprises a 2,3-dimethoxy-5-methylbenzoquinone nucleus (common to all ubiquinones) and a side chain of eight isoprenoid units. | ubiquinone-8 |
| ubiquinone 9 | | ubiquinone-9 |
| ubiquinone q1 | A compound composed of the standard 2,3-dimethoxy-5-methylbenzoquinone nucleus common to ubiquinones; and a side chain of a single isoprenoid unit. | ubiquinone-1 |
| ubiquinone q2 | A compound composed of the 2,3-dimethoxy-5-methylbenzoquinone nucleus common to ubiquinones; and a side chain of two isoprenoid units. | ubiquinone-2 |
| ubiquinone-o | A derivative of benzoquinone carrying a 5-methyl substituent; and methoxy substituents at positions 2 and 3. The core structure of the ubiquinone group of compounds. | ubiquinone-0 |