InChI=1S/C21H28NO6/c1-13(23)22(2)8-6-14-9-19(27-3)18(25)10-15(14)16(22)11-21(26)7-5-17(24)20(12-21)28-4/h9-10,12,16,25-26H,5-8,11H2,1-4H3