ERROR opening https://cactus.nci.nih.gov/chemical/structure/CC1%28C%5BC%40H%5D%28N%29C%28O%29%3DO%29N%3DN1/file?format=sdf&get3d=True  -- CC1%28C%5BC%40H%5D%28N%29C%28O%29%3DO%29N%3DN1 could not be loaded.