InChI=1S/C16H18O5/c1-10-5-3-2-4-6-12(17)7-11-8-13(18)9-14(19)15(11)16(20)21-10/h4,6,8-10,18-19H,2-3,5,7H2,1H3/b6-4-/t10-/m0/s1