2Bz4OH5Pyrrol-N-IndanBuCONH2 isostere 5-[2(S)-[(1,1-Dimethylethyl)aminocarbonyl]-1-pyrrolidinyl]-4(S)-hydroxy-N-(2(R)-hydroxy-1(S)-indanyl)-2(R1)-(phenylmethyl)pentanamide AIDS-006757 AIDS006757