Acyl‐CoA: cholesterolacyltransferase (ACAT) inhibitors 8a–f was synthesized; the substances were characterized by the presence of a 2,5‐dimethylpyrazin‐3‐yl moiety at one end and a 3‐heptylamino‐5‐phenylpyridazine system at the other one, linked through linear alkyl spacers of different length. The new derivatives were designed based on the hypothesis that the 3‐amino‐5‐phenylpyridazine moiety could mimic