(3Z)-3-butylidene-5-hydroxy-2-benzofuran-1(3H)-one 1(3H)-isobenzofuranone, 3-butylidene-5-hydroxy-, (3Z)- InChI=1/C12H12O3/c1-2-3-4-11-10-7-8(13)5-6-9(10)12(14)15-11/h4-7,13H,2-3H2,1H3/b11-4