ERROR opening https://cactus.nci.nih.gov/chemical/structure/CCCN%28CCC%29C1CCC2%26%2361%3BC%28C1%29C%28%26%2361%3BCC%26%2361%3BC2%29O/file?format=sdf&get3d=True -- CCCN%28CCC%29C1CCC2%26%2361%3BC%28C1%29C%28%26%2361%3BCC%26%2361%3BC2%29O could not be loaded.