InChI=1S/C20H23NO4/c1-11(22)24-16-7-5-13-14-10-12-4-6-15(23-3)18-17(12)20(13,19(16)25-18)8-9-21(14)2/h4,6-7,13-14,19H,5,8-10H2,1-3H3/t13-,14+,19-,20-/m0/s1