AIDS-031557 AIDS031557 BHAP analog Psychosine deriv. [R-[R*,S*-(E)]]-N-[1-(.beta.-D-Galactopyranosyloxy)methyl]-2-hydroxy- 3-heptadecenyl]-6-[2-[[4-[3-[(1-methylethyl)amino]-2-pyridinyl]-1-piperazinyl]carbonyl]-1H-indol-5-yl]oxy]hexanamide