One object of the present invention are novel substituted piperidyl-propane-thiols of the formula (1), wherein R1, R2, R3 and D are defined as below. Another object of the present invention is to provide agonists or antagonists of CCR-3, or pharmaceutically acceptable salts thereof, more particularly to provide pharmaceutical compositions comprising a pharmaceutically acceptable carrier and a therapeutically effective amount of at least one of the compounds of the present invention or a pharmaceutically acceptable salt thereof.