InChI=1S/C13H21NO3/c1-4-8(2)13(16)17-12-6-9-5-10(15)7-11(12)14(9)3/h4,9-12,15H,5-7H2,1-3H3/b8-4+/t9-,10-,11+,12?/m1/s1