C 2993 (OTTO) 3-Cyanobenzoic acid, 98% Cas 1877-72-1 - used in the preparation of new Co(II)-doped Zn(II)-tetrazole-benzoate coordination polymers via in situ [2+3] cycloaddition reactions with NaN3 in the presence of Zn(II) and/or Co(II) salts under hydrothermal conditions.