ERROR opening https://cactus.nci.nih.gov/chemical/structure/C%5BC%40H%5D%28C%28%3DO%29%5BO-%5D%29%5BNH3%20%5D/file?format=sdf&get3d=True -- C%5BC%40H%5D%28C%28%3DO%29%5BO-%5D%29%5BNH3%20%5D could not be loaded.