InChI=1/C21H20O2/c22-18-8-9-20-16(12-18)6-7-17-13-19(23)10-11-21(17,20)14-15-4-2-1-3-5-15/h1-5,8-9,12-13,22H,6-7,10-11,14H2/t21-/m0/s1 9892430CE7EBE67B