: D 2613 (OTTO) 3,6-Dichloropyridazine, 97% Cas 141-30-0 - used as an intermediate in synthetic chemistry, especially in active pharmaceutical ingredients. D 2613 (OTTO) 3,6-Dichloropyridazine, 97% Cas 141-30-0 - used in the preparation of alfa-(halohetaroyl)-2-azahetarylacetonitriles.