ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%3DC1NC2%3DNc3c%28CN2C1%29c%28Cl%29c%28cc3%29Cl/file?format=sdf&get3d=True  -- O%3DC1NC2%3DNc3c%28CN2C1%29c%28Cl%29c%28cc3%29Cl could not be loaded.