InChI=1S/C15H18O8/c1-6-4-8(16)5-9(17)10(6)14(20)23-13-12(19)11(18)7(2)22-15(13)21-3/h4-5,7,11,13,15-18H,1-3H3/t7-,11+,13-,15-/m0/s1