ERROR opening https://cactus.nci.nih.gov/chemical/structure/CCCN2CCCC%5BC%40H%5D2C%28%3DO%29Nc1c%28C%29cccc1C/file?format=sdf&get3d=True  -- CCCN2CCCC%5BC%40H%5D2C%28%3DO%29Nc1c%28C%29cccc1C could not be loaded.