難溶性薬物(R)-1-[2,3-Dihydro-1-(2'-methylphenacyl)-2-oxo-5-phenyl-1H-1,4-benzodiazepin-3-yl]-3-(3-methylphenyl)urea(YM022)の結晶形の検討及び溶解性, 吸収性改善について