1-[[5-[[(4-Methyl-1-piperazinyl)carbonyl]amino]indol-2-yl]carbonyl]-4-[N-ethyl-N-[3-[(1,1-dimethylethyl)amino-6-fluoro-2-pyridinyl]-amino]piperidine AIDS-032931 AIDS032931 Alkylamino-piperidine analog