InChI=1S/C14H16O5/c15-12(16)10-8-6-4-2-1-3-5-7-9-11-13(19-11)14(17)18/h1-7,9,11,13H,8,10H2,(H,15,16)(H,17,18)/b2-1+,5-3-,6-4+,9-7+