InChI=1S/C21H39NO5/c1-5-6-7-8-9-10-11-12-13-14-18(23)15-21(26)27-19(16-20(24)25)17-22(2,3)4/h12-13,18-19,23H,5-11,14-17H2,1-4H3/b13-12-/t18?,19-/m1/s1