InChI=1S/C17H25NO3/c1-13(2)7-5-4-6-8-17(20)18-12-14-9-10-15(19)16(11-14)21-3/h5,7,9-11,13,19H,4,6,8,12H2,1-3H3,(H,18,20)/b7-5+