InChI=1S/C14H14O5/c15-12(16)10-8-6-4-2-1-3-5-7-9-11-13(19-11)14(17)18/h1-11,13H,(H,15,16)(H,17,18)/b2-1-,5-3+,6-4+,9-7+,10-8-