1-(1-(4-(4-fluorophenyl)-4-oxobutyl)piperidin-4-yl)-1H-benzo[d]imidazol-2(3H)-one-D4; 1-[1-[4-(4-Fluorophenyl)-4-oxobutyl]-4-piperidinyl]-1,3-dihydro-2H-benzimidazol-2-one-D4; 1-(1-[4-(p-Fluorophenyl)-4-oxobutyl]piperidin-4-yl)-2-benzimidazolinone-D4; 1-[1-[3-(p-Fluorobenzoyl)propyl]-4-piperidyl]-2-benzimidazolinone-d5
