InChI=1S/C18H18O3/c19-12-9-7-11(8-10-12)18-14-4-1-3-13(14)17-15(20)5-2-6-16(17)21-18/h2,5-10,13-14,18-20H,1,3-4H2/t13-,14+,18+/m1/s1