ERROR opening https://cactus.nci.nih.gov/chemical/structure/CC%28NCCC%28c1ccccc1%29c2ccccc2%29c3ccccc3/file?format=sdf&get3d=True  -- CC%28NCCC%28c1ccccc1%29c2ccccc2%29c3ccccc3 could not be loaded.