1,2-Dihydroxy-9,10-dimethoxy-3,3-dimethyl-2,3,13,13a-tetrahydro-1H,7aH-pyrano[2,3-c;6,5-f']dichromen-7-one Derrisin InChI=1/C23H24O8/c1-23(2)22(26)20(25)18-12(31-23)6-5-10-19(24)17-11-7-14(27-3)15(28-4)8-13(11)29-9-16(17)30-21(10)18/h5-8,16-17,20,22,25-26H,9H2,1-4H3/t16?,17?,20-,22+/m0/s rel-(1R,2S)-1,2-dihydroxy-9,10-dimethoxy-3,3-dimethyl-2,3,13,13a-tetrahydro-1H-chromeno[3,4-b]pyrano[2,3-h]chromen-7(7aH)-one (non-preferred name)