ERROR opening https://cactus.nci.nih.gov/chemical/structure/CCNCc1nc2c%28n1CC%28C%29%28C%29O%29c3ccccc3nc2N/file?format=sdf&get3d=True  -- CCNCc1nc2c%28n1CC%28C%29%28C%29O%29c3ccccc3nc2N could not be loaded.