InChI=1S/C21H25NO8/c1-5-6-7-8-12(23)15-16(27)11(2)18(28)21(4)17(15)20(3,19(29)30-21)22-13(24)9-10-14(25)26/h5-6,9-10,17,27-28H,7-8H2,1-4H3,(H,22,24)(H,25,26)/b6-5+,10-9+/t17-,20+,21+/m1/s1