5-[2(S)-[(1,1-Dimethylethyl)aminocarbonyl]-4-[(3-pyridinylsulfonyl)-1-piperazinyl]-4(S)-hydroxy-N-(2(R)-hydroxy-1(S)-indanyl)-2(R)-(phenylmethyl)pentanamide AIDS-033560 AIDS033560 L-735,524 analog