InChI=1/C18H18O5/c1-2-3-12-13(20)8-14(21)17-15(22)9-16(23-18(12)17)10-4-6-11(19)7-5-10/h4-8,16,19-21H,2-3,9H2,1H3/t16-/m0/s1 428B12DE9E56AFBF