InChI=1S/C16H18O9/c17-11-12(18)14(15(20)21)25-16(13(11)19)22-5-1-2-8-3-4-9-10(6-8)24-7-23-9/h1-4,6,11-14,16-19H,5,7H2,(H,20,21)/b2-1-