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crystal data
The α form of iminodiacetic acid, HN(CH2COOH)2, C4H7NO4, is found to be orthorhombic, space group Pb21a. The lattice parameters of the unit cell with eight molecules are a0 = 14.172 (7), b0 = 14.977 (8) and c0 = 5.276 (3) Å. The crystals melt with decomposition at 520 (2) K. X-ray powder diffraction data are reported.