ERROR opening https://cactus.nci.nih.gov/chemical/structure/C1%26%2361%3BCC%26%2361%3BC%28C%26%2361%3BC1%29NN/file?format=sdf&get3d=True  -- C1%26%2361%3BCC%26%2361%3BC%28C%26%2361%3BC1%29NN could not be loaded.