ERROR opening https://cactus.nci.nih.gov/chemical/structure/CCNC%28CC1%3DCC%3DCC%3DC1%29C2%3DCC%3DCC%3DC2/file?format=sdf&get3d=True  -- CCNC%28CC1%3DCC%3DCC%3DC1%29C2%3DCC%3DCC%3DC2 could not be loaded.