ERROR opening https://cactus.nci.nih.gov/chemical/structure/c4c3c%28c1ccccc1c%28c2ccccc2%29c3ccc4%29c5ccccc5/file?format=sdf&get3d=True  -- c4c3c%28c1ccccc1c%28c2ccccc2%29c3ccc4%29c5ccccc5 could not be loaded.