ERROR opening https://cactus.nci.nih.gov/chemical/structure/c1ccc2c%28c1%29cc-3c4c2cccc4-c5c3cccc5/file?format=sdf&get3d=True  -- c1ccc2c%28c1%29cc-3c4c2cccc4-c5c3cccc5 could not be loaded.