InChI=1S/C15H18O9/c16-8-4-6(3-7-5-22-7)1-2-9(8)23-15-12(19)10(17)11(18)13(24-15)14(20)21/h1-2,4,7,10-13,15-19H,3,5H2,(H,20,21)