InChI=1/C20H19NO4/c1-12-4-6-18(23-3)16(8-12)21-10-15-17(24-11-21)7-5-14-13(2)9-19(22)25-20(14)15/h4-9H,10-11H2,1-3H3 2B4919FC2650D27C