InChI=1S/C15H20O5/c1-14(2,18)7-6-12-15(3,19)10-5-4-9(13(16)17)8-11(10)20-12/h4-5,8,12,18-19H,6-7H2,1-3H3,(H,16,17)/t12-,15-/m1/s1