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metal-organic compounds
The molecular structure of disodium fluorescein octahydrate, 2Na+.C20H10O52-.8H2O, exhibits a quinonoid form [sodium 2-(3-oxo-6-sodioxy-3H-xanthen-9-yl)benzoate]. The crystal includes eight water molecules in an asymmetric unit in the cell. Two Na-O(hydroxy) distances are 2.568 (4) (Na2-O2) and 2.343 (3) Å (Na1-O4).