ERROR opening https://cactus.nci.nih.gov/chemical/structure/Cn1cnc%28N%28%3DO%29%3DO%29c1Sc2ncnc3nc%5BnH%5Dc23/file?format=sdf&get3d=True  -- Cn1cnc%28N%28%3DO%29%3DO%29c1Sc2ncnc3nc%5BnH%5Dc23 could not be loaded.