Abstract. C7H1204, Mr= 160.17, monoclinic, P2, a=7.338(1), b= 10.626(1), c= 11.237(,2)A, fl= 93.47 (1) °, V= 874.6 (2) A s, Z = 4, Ox= 1.22gcm -3, ~,(CuKa)=1.54180]k, #=9.7cm -~, F(000)=344, T=291K, R=0.038 for 1431 observed reflections. The asymmetric unit contains two independent molecules linked by two intermolecular hydrogen bonds. The two carboxylic groups are rotated by 79 ° and give extensive zigzag chains along the c axis.
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