2H-1-benzopyran-3,5,7-triol, 2-[3,4-bis(acetyloxy)phenyl]-3,4-dihydro-, 3-acetate 4-[3-(acetyloxy)-5,7-dihydroxy-3,4-dihydro-2H-chromen-2-yl]-1,2-phenylene diacetate InChI=1/C21H20O9/c1-10(22)27-17-5-4-13(6-19(17)28-11(2)23)21-20(29-12(3)24)9-15-16(26)7-14(25)8-18(15)30-21/h4-8,20-21,25-26H,9H2,1-3H