ERROR opening https://cactus.nci.nih.gov/chemical/structure/CC%28C%29CN1C%3DNC2%3DC1C3%3DCC%3DCC%3DC3N%3DC2N/file?format=sdf&get3d=True -- CC%28C%29CN1C%3DNC2%3DC1C3%3DCC%3DCC%3DC3N%3DC2N could not be loaded.