ERROR opening https://cactus.nci.nih.gov/chemical/structure/CNC%28%3DNC%29CC1%3DCC2%3DCC%3DCC%3DC2C%3DC1/file?format=sdf&get3d=True  -- CNC%28%3DNC%29CC1%3DCC2%3DCC%3DCC%3DC2C%3DC1 could not be loaded.