ERROR opening https://cactus.nci.nih.gov/chemical/structure/C%28OO%5BN%2B%5D%28%3DO%29%5BO-%5D%29%28C%29%3DO/file?format=sdf&get3d=True -- C%28OO%5BN%2B%5D%28%3DO%29%5BO-%5D%29%28C%29%3DO could not be loaded.