1H,3H-furo[3,4-c]furan-1-one, 6-(3,4-dihydroxyphenyl)tetrahydro-3-(4-hydroxy-3,5-dimethoxyphenyl)-, (3S,6S)- 2alpha-Guaicyl-4-oxo-6alpha-catechyl-3,7-dioxabicyclo[3.3.0]octane 6-(3,4-Dihydroxy-phenyl)-3-(4-hydroxy-3,5-dimethoxy-phenyl)-tetrahydro-furo[3,4-c]furan-1-one InChI=1/C20H20O8/c1-25-14-6-10(7-15(26-2)17(14)23)18-11-8-27-19(16(11)20(24)28-18)9-3-4-12(21)13(22)5-9/h3-7,11,16,18-19,21-23H,8H2,1-2H3/t11?,16?,18-,19-/m1/s rel-(3R,6R)-6-(3,4-dihydroxyphenyl)-3-(4-hydroxy-3,5-dimethoxyphenyl)tetrahydro-1H,3H-furo[3,4-c]furan-1-one