InChI=1S/C19H18O6/c20-15-3-1-12(7-16(15)21)6-14-13(9-23-19(14)22)5-11-2-4-17-18(8-11)25-10-24-17/h1-4,7-8,13-14,20-21H,5-6,9-10H2/t13-,14+/m0/s1