AIDS-028541 AIDS028541 Carbamic acid, [(1S,2S,4R,6E)-2-hydroxy-4-[[[(1S)-2-methyl-1-(4H-1,2,4-triazol-3-yl)propyl]amino]carbonyl]-7-phenyl-1-(phenylmethyl)-6-heptenyl]-, 1,1-dimethylethyl ester PhCH=CH-Ala-Phe-HOCH2CH2 isostere analog SB-206135