Thymoquinone and Dithymoquinone are found in black seeds (Nigella sativa).
From their structures, dithymoquinone has 2 rings while thymoquinone has 1 ring. One would expect that dithymoquinone would be a better drug candidate than thymoquinone; hence there should be more work on it. But the reverse is the case, while there are numerous works on thymoquinone, works on dithymoquinone is almost none existent! Is there any particular reason for this please?