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Structural model subtypes for Q. Includes structural representatives for the OC -OH/-OH (OC10), OC -OH/=O (OC26) subclasses at the top, and bis(μO) (bis(μO-1)), bis(μO)-OH (bis(μO)-OH-16), and bis(μO)-H2O (bis(μO)-H2O-6) subclasses at the bottom.