InChI=1S/C18H18O5/c19-14-3-1-2-11(7-14)6-13-10-23-18(22)15(13)8-12-4-5-16(20)17(21)9-12/h1-5,7,9,13,15,19-21H,6,8,10H2/t13-,15+/m0/s1