Meh, it’s a benzene ring but with the hydroxyl and other groups on, it is a diminished benzene ring, the inter-ring bonds aren’t quite as stable as a pure aromatic ring.
Has to do with the electron bonds having slightly longer lengths than in their 1.5 configuration. The difference is prety minor.
It’s stable in terms of solute chemistry, compared to other crystalline stuff it can be much weaker.