ERROR opening https://cactus.nci.nih.gov/chemical/structure/CC%28N%29Cc2c1c%28%5BnH%5Dc2%29cccc1C/file?format=sdf&get3d=True  -- CC%28N%29Cc2c1c%28%5BnH%5Dc2%29cccc1C could not be loaded.