InChI=1S/C18H23NO4/c1-22-17-8-3-13(11-18(17)23-2)9-10-19-12-16(21)14-4-6-15(20)7-5-14/h3-8,11,16,19-21H,9-10,12H2,1-2H3/t16-/m0/s1