InChI=1S/C17H22O5/c1-11(4-3-5-12(2)10-18)6-7-13-8-14(17(21)22)16(20)9-15(13)19/h5-6,8-9,18-20H,3-4,7,10H2,1-2H3,(H,21,22)/b11-6?,12-5+