4-Morpholinebutanamide, .beta.-hydroxy-N-[2-[[2-hydroxy-5-methyl-1-(2-methylpropyl)-4-[[[2-methyl-1-[[(2-pyridinylmethyl)amino]carbonyl]butyl]amino]carbonyl]hexyl]amino]-1-(1H-imidazol-4-ylmethyl)-2-oxoethyl]-.alpha.-(1-naphthalenylmethyl)-.tau.-oxo-, [1S[1R*(.alpha.S*,.beta.R*)],2R*,4R*(1R*,2R*)]]- AIDS-082242 AIDS082242