ERROR opening https://cactus.nci.nih.gov/chemical/structure/c2c%28/C1%26%2361%3BC/CN%28C%29CC1%29cccc2/file?format=sdf&get3d=True  -- c2c%28/C1%26%2361%3BC/CN%28C%29CC1%29cccc2 could not be loaded.