ERROR opening https://cactus.nci.nih.gov/chemical/structure/Clc2cc%28c1ccc%28N%29c%28Cl%29c1%29ccc2N/file?format=sdf&get3d=True  -- Clc2cc%28c1ccc%28N%29c%28Cl%29c1%29ccc2N could not be loaded.