2Bz4OH5Piperid-N-IndanBuCONH2 isostere 5-[2(S)-[(1,1-Dimethylethyl)aminocarbonyl]-1-piperidinyl]-4(R)-hydroxy-N-(2(R)-hydroxy-1(S)-indanyl)-2(R)-(phenylmethyl)pentanamide AIDS-006758 AIDS006758