InChI=1S/C22H28O4/c1-17(13-9-15-19(3)21(23)25-5)11-7-8-12-18(2)14-10-16-20(4)22(24)26-6/h7-16H,1-6H3/b8-7+,13-9+,14-10+,17-11-,18-12+,19-15+,20-16-