InChI=1S/C14H21NO4/c1-4-5-6-7-9-14(3,18)12(16)10-11(19-9)8(2)15-13(10)17/h9,12,16,18H,2,4-7H2,1,3H3,(H,15,17)/t9-,12-,14-/m0/s1