Reduction of hERG inhibitory activity in the 4-piperidinyl urea series of H3 antagonists.

Abstract Structural features of the substituted 4-piperidinyl urea analogs 1 , responsible for the H3 antagonist activity, have been identified. Structure–activity relationship of the H3 receptor affinity, hERG ion channel inhibitory activity and their separation is described. Preliminary pharmacokinetic evaluation of the compounds of the series is addressed.