InChI=1S/C19H21NO4/c1-22-13-5-4-10-8-12-15-11(6-7-20-12)9-14(23-2)19(24-3)17(15)16(10)18(13)21/h4-5,9,12,20-21H,6-8H2,1-3H3/t12-/m1/s1