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Mithoron
Mithoron
00:24
@CowperKettle Well it's partially hydrogenated biopterine
Dihydrobiopterin
Dihydrobiopterin (BH2) is a pteridine compound produced in the synthesis of L-DOPA, dopamine, norepinephrine and epinephrine. It is restored to the required cofactor tetrahydrobiopterin by dihydrobiopterin reductase. == See also == Pteridine Tetrahydrobiopterin...
This ring with keto group is a quinoid ring. If one of the bonds here was hydrogenated it wouldn't be, but the bond in the other ring was. I guess it could have a non-quinoid isomer, but I it would be called differently, I guess.

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