InChI=1S/C21H28O7/c1-19-6-4-12(23)8-11(19)2-3-13-14-5-7-21(28,16(25)10-22)20(14,18(26)27)9-15(24)17(13)19/h8,13-15,17,22,24,28H,2-7,9-10H2,1H3,(H,26,27)/t13-,14-,15?,17+,19-,20-,21+/m0/s1