ERROR opening https://cactus.nci.nih.gov/chemical/structure/C1%3DCC%3DC%28C%3DC1%29%20CNC2%3DNC%3DNC3%3DC2NC%3DN3/file?format=sdf&get3d=True -- C1%3DCC%3DC%28C%3DC1%29%20CNC2%3DNC%3DNC3%3DC2NC%3DN3 could not be loaded.