(R-(Z))-(2-Hydroxy-2-methyl-1-(((7-oxo-7H-furo(3,2-g)(1)benzopyran-4-yl)oxy)methyl)propyl) 2-methyl-2-butenoate 2-Butenoic acid, 2-methyl-, (2-hydroxy-2-methyl-1-(((7-oxo-7H-furo(3,2-g)(1)benzopyran-4-yl)oxy)methyl)propyl) ester, (R-(Z))- 642-08-0 Ostruthol