InChI=1S/C18H21NO5/c1-24-16-12-13(2-4-15(16)21)3-5-17(22)19-11-10-18(23)8-6-14(20)7-9-18/h2,4,6-9,12,21,23H,3,5,10-11H2,1H3,(H,19,22)