AIDS-031556 AIDS031556 BHAP analog Sphingosine deriv. [R-[R*,S*-(E)]]-N-[2-Hydroxy-1-(hydroxymethyl)-3-heptadecenyl]-6-[2-[[4-[3-[(1-methylethyl)amino]-2-pyridinyl]-1-piperazinyl]carbonyl]-1H-indol-5-yl]oxy]hexanamide