5-hydroxy-7,9-dimethoxy-3,4,5-trimethylnaphtho[2,3-b]furan-8(5H)-one InChI=1/C17H18O5/c1-8-7-22-16-11(8)9(2)13-12(15(16)21-5)14(18)10(20-4)6-17(13,3)19/h6-7,19H,1-5H naphtho[2,3-b]furan-8(5H)-one, 5-hydroxy-7,9-dimethoxy-3,4,5-trimethyl-