InChI=1S/C14H16O4/c1-11(7-9-13(15)16)5-3-4-6-12(2)8-10-14(17)18/h3-10H,1-2H3,(H,15,16)(H,17,18)/b4-3+,9-7+,10-8+,11-5+,12-6+