ERROR opening https://cactus.nci.nih.gov/chemical/structure/c1cnccc1-c2c%28C%29%5BnH%5Dc%28%3DO%29c%28C%23N%29c2/file?format=sdf&get3d=True  -- c1cnccc1-c2c%28C%29%5BnH%5Dc%28%3DO%29c%28C%23N%29c2 could not be loaded.