ERROR opening https://cactus.nci.nih.gov/chemical/structure/c1ccc2c%28c1%29cc3c4ccccc4c5cccc6c5c3c2cc6/file?format=sdf&get3d=True  -- c1ccc2c%28c1%29cc3c4ccccc4c5cccc6c5c3c2cc6 could not be loaded.