ERROR opening https://cactus.nci.nih.gov/chemical/structure/CC1%26%2361%3BC%28N%26%2361%3BCC%26%2361%3BC1%29N/file?format=sdf&get3d=True  -- CC1%26%2361%3BC%28N%26%2361%3BCC%26%2361%3BC1%29N could not be loaded.