InChI=1S/C15H21NO4/c1-14-11(7-8-20-14)13(19)16-15(14,9-17)12(18)10-5-3-2-4-6-10/h3,5,9-12,18H,2,4,6-8H2,1H3,(H,16,19)/t10-,11+,12+,14+,15-/m1/s1