ERROR opening https://cactus.nci.nih.gov/chemical/structure/CCCCS%28%3DN%29%28%3DO%29CCC%28C%28%3DO%29O%29N/file?format=sdf&get3d=True  -- CCCCS%28%3DN%29%28%3DO%29CCC%28C%28%3DO%29O%29N could not be loaded.