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metal-organic compounds
A feature of the title compound, sodium 5-amino-2-naphtthalenesulphonate-Water (1/4), Na+.C10H8NO3S-.4H2O, is that of the Na+ ions which are coordinated by edge-sharing distorted octahedra of water O atoms. The coordination distances around Na+ vary from 2.217 (8) to 2.80 (1) Å.