ERROR opening https://cactus.nci.nih.gov/chemical/structure/Clc4ccccc4C/3%3DN/Cc1nncn1c2c%5C3nc%28Cl%29cc2/file?format=sdf&get3d=True  -- Clc4ccccc4C/3%3DN/Cc1nncn1c2c%5C3nc%28Cl%29cc2 could not be loaded.