3,6-Bis(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-9,9'-spirobi[9H-fluorene]-2,2',7,7'-tetracarboxylic dianhydride

3,6-Bis(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-9,9'-spirobi[9H-fluorene]-2,2',7,7'-tetracarboxylic dianhydride · CAS 1623119-27-6