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/h5,7,9-10,16,20,25-26H,6,8,11-12H2,1-4H3