ERROR opening https://cactus.nci.nih.gov/chemical/structure/c1cc2c%28c%28c1%29N%29c%28%3DO%29%5BnH%5D%20%5BnH%5Dc2%3DO/file?format=sdf&get3d=True  -- c1cc2c%28c%28c1%29N%29c%28%3DO%29%5BnH%5D%20%5BnH%5Dc2%3DO could not be loaded.