1-(3,5-Dichloro-1-hydroxy-pyridin-4-yl)-1-(4-{(S)-3-methyl-4-[(S)-1-(4-trifluoromethyl-phenyl)-ethyl]-piperazin-1-yl}-piperidin-1-yl)-methanone AIDS-105217 AIDS105217 Piperazine deriv