ERROR opening https://cactus.nci.nih.gov/chemical/structure/C1%26%2361%3BCC2%26%2361%3BC%28C%26%2361%3BC1O%29C%28%26%2361%3BCN2%29CCN/file?format=sdf&get3d=True -- C1%26%2361%3BCC2%26%2361%3BC%28C%26%2361%3BC1O%29C%28%26%2361%3BCN2%29CCN could not be loaded.