To provide, e.g., a new form of a particularly poorly water-insoluble compound, i.e., Compound 1, which shows better
bioavailability and has chemical and
physical stability during formulation and storage of this
drug.SOLUTION: Disclosed herein are: a physically stable
solid dispersion comprising Compound 1, i.e., the B-
RAF kinase dimer inhibitor 1-((1S,1aS,6bS)-5-((7-oxo-5,6,7,8-tetrahydro-1,8-naphthyridin-4-yl)oxy)-1a,6b-dihydro-1H-cyclopropa[b]
benzofuran-1-yl)-3-(2,4,5-trifluorophenyl)
urea and a specific stabilizing
polymer; a method of preparing the same; uses of the
solid dispersion; and a crystalline form of Compound 1.SELECTED DRAWING: None