InChI=1S/C16H20O6/c1-6(17)5-10-12-11(7(2)9(4)22-10)8(3)14(18)13(15(12)19)16(20)21/h7,9-10,18-19H,5H2,1-4H3,(H,20,21)/t7-,9-,10+/m1/s1