InChI=1S/C19H22O3/c20-17-10-6-16(7-11-17)9-13-19(22)14-18(21)12-8-15-4-2-1-3-5-15/h1-8,10-12,18-22H,9,13-14H2/b12-8+/t18-,19+/m0/s1