4-tert-Butyl-2-(2'-(1,3-dioxolan-2-yl)-6-methoxy[1,1'-biphenyl]-2-yl)-4,5-dihydro-1,3-oxazole 6-(4-tert-Butyl-4,5-dihydro-1,3-oxazol-2-yl)-2'-(1,3-dioxolan-2-yl)[1,1'-biphenyl]-2-yl methyl ether AIDS-138115 AIDS138115 NSC644270