InChI=1S/C17H22O4/c1-10(9-20-12(3)18)15-13(19)7-8-17-14(21-17)6-5-11(2)16(15,17)4/h7-9,11,14-15H,5-6H2,1-4H3/b10-9+/t11-,14?,15-,16-,17?/m0/s1