InChI=1/C18H21NO4/c1-2-3-4-5-7-14-10-11-18(17(20)12-14)23-16-9-6-8-15(13-16)19(21)22/h6,8-13,20H,2-5,7H2,1H3 4B7C5F2239A7C15A