ERROR opening https://cactus.nci.nih.gov/chemical/structure/Clc1cccc%28NN%3DC%28C%23N%29C%23N%29c1/file?format=sdf&get3d=True  -- Clc1cccc%28NN%3DC%28C%23N%29C%23N%29c1 could not be loaded.