InChI=1S/C15H21NO3/c1-9-5-10(2)15(19)12(6-9)4-3-11-7-13(17)16-14(18)8-11/h4,9-11H,3,5-8H2,1-2H3,(H,16,17,18)/b12-4+/t9-,10-/m0/s1