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