ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI=1S/C20H18O/c21-20-18(14-16-8-3-1-4-9-16)12-7-13-19(20)15-17-10-5-2-6-11-17/h1-6,8-11,14-15H,7,12-13H2/file?format=sdf&get3d=True  -- InChI=1S/C20H18O/c21-20-18(14-16-8-3-1-4-9-16)12-7-13-19(20)15-17-10-5-2-6-11-17/h1-6,8-11,14-15H,7,12-13H2 could not be loaded.