InChI=1S/C19H22O4/c1-11-7-14(20)8-16-15(11)4-3-12(2)19(16)9-17(23-18(19)21)13-5-6-22-10-13/h5-7,10,12,15-17H,3-4,8-9H2,1-2H3/t12-,15+,16+,17-,19-/m1/s1