InChI=1S/C22H24O5/c1-2-3-7-16-25-21(23)14-15-22(24)26-17-18-10-12-20(13-11-18)27-19-8-5-4-6-9-19/h4-6,8-15H,2-3,7,16-17H2,1H3/b15-14+