ERROR opening https://cactus.nci.nih.gov/chemical/structure/CC%28C%29N%28C%29CCc1c%5BnH%5Dc%28cc2%29c1cc2C/file?format=sdf&get3d=True  -- CC%28C%29N%28C%29CCc1c%5BnH%5Dc%28cc2%29c1cc2C could not be loaded.