ERROR opening https://cactus.nci.nih.gov/chemical/structure/C1%5BC%40H%5D%28NC%28%3DN%29N1%29C%5BC%40%40H%5D%28C%28%3DO%29O%29N/file?format=sdf&get3d=True -- C1%5BC%40H%5D%28NC%28%3DN%29N1%29C%5BC%40%40H%5D%28C%28%3DO%29O%29N could not be loaded.