Structure of 1H-indazole-3-carboxylic acid

C 8 H 6 N 2 O 2 , M r =162.15, monoclinic, P2 1 /n, a=10.402 (2), b=15.025 (3), c=9.467 (2) A, β=96.24 (3) o , V=1470.8 (5) A 3 , Z=8, D m (flotation in heptane/carbon tetrachloride)=1.45, D x =1.46 Mg m -3 , λ(Mo Kα)=0.71069 A, μ=0.102 mm -1 , F(000)=672, T=295 K, R=0.041 (wR=0.048) for the 2105 observed reflections with I≥2.5σ(I). In both molecules of the asymmetric unit the carboxy group prefers a near coplanar [4.8 (1) and 5.4 (1) o ] and transoid orientation with respect to the strictly planar heterocyclic ring