ERROR opening https://cactus.nci.nih.gov/chemical/structure/Clc2ccc%28c1c%28nc%28nc1CC%29N%29N%29cc2/file?format=sdf&get3d=True  -- Clc2ccc%28c1c%28nc%28nc1CC%29N%29N%29cc2 could not be loaded.