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