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