ERROR opening https://cactus.nci.nih.gov/chemical/structure/CCN%28CC%29CCOc1ccc2c%28c1%29sc%28n2%29N%28C%29C/file?format=sdf&get3d=True  -- CCN%28CC%29CCOc1ccc2c%28c1%29sc%28n2%29N%28C%29C could not be loaded.