InChI=1/C20H21NO4/c1-20(2,3)13-9-7-12(8-10-13)16-15(18(23)19(24)21(16)4)17(22)14-6-5-11-25-14/h5-11,16,23H,1-4H3/p-1/t16-/m1/s1/fC20H20NO4/h23h/q-1 F641BA5E616DBFA8