InChI=1S/C19H26O4/c1-11(2)18(20)22-16-10-15-14(5)19(21)23-17(15)9-12(3)7-6-8-13(16)4/h8-9,11,15-17H,5-7,10H2,1-4H3/b12-9+,13-8+