“…The observed values of the interior angles at vertices C I-C6, with the calculated values in brackets, are: 119.4 (2) [ 118.4 (3)], 120.6 (I) [ 120.2 (4)], 120.1 ( I ) [121.3(4)], 118.5(1) [117.9(4)], 121.8(1) [122.8(5)], and 119.4 (1) ° [119.8 (4)°]. The r.m.s, deviation between these pairs of values is 0.7 °, which may be compared with values of 0.5 and 0.6 ° calculated in a similar way for the related molecules 3-aminobenzoic acid (Voogd et al, 1980) and isophthalic acid (Derissen, 1974), respectively. Further, When the calculated and observed interior ring angles are ordered by magnitude, the orderings differ by only a single inversion.…”