144185-90-0 AIDS-043386 AIDS043386 Bis(Val-NH)-diF-acetone deriv. Butanamide, N,N'-[2,2-difluoro-3-oxo-1,4-bis(phenylmethyl)-1,4-butanediyl]bis[3-methyl-2-[[[2-(2-pyridinyl)ethyl]sulfonyl]amino]-, [1S-[1R*(R*),4R*(R*)]]-