InChI=1S/C28H44N4O4/c1-9-19(6)24(32(7)8)28(35)31-23-25(18(4)5)36-21-12-10-20(11-13-21)14-15-29-26(33)22(16-17(2)3)30-27(23)34/h10-15,17-19,22-25H,9,16H2,1-8H3,(H,29,33)(H,30,34)(H,31,35)/b15-14-