ERROR opening https://cactus.nci.nih.gov/chemical/structure/C1%26%2361%3BC%26%2391%3BSe%26%2393%3BC%26%2361%3BC1/file?format=sdf&get3d=True  -- C1%26%2361%3BC%26%2391%3BSe%26%2393%3BC%26%2361%3BC1 could not be loaded.