InChI=1S/C18H21NO4/c1-19-6-5-12-9-18(23-2)17(22)10-13(12)14(19)7-11-3-4-15(20)16(21)8-11/h3-4,8-10,14,20-22H,5-7H2,1-2H3/t14-/m0/s1