(2-{3-[(3-Cyclohexyl-2,5-dioxo-12-oxa-1,4-diazatricyclo[11.5.3.0]henicosa-13(21),14,16(20)-triene-18-carbonyl)amino]-]-2-oxohexanoylamino}acetylamino)phenylacetic acid tert-butyl ester AIDS-160182 AIDS160182