ERROR opening https://cactus.nci.nih.gov/chemical/structure/C1CN%28CCN1%29C2%3DCC3%3DCC%3DCC%3DC3C%3DC2/file?format=sdf&get3d=True -- C1CN%28CCN1%29C2%3DCC3%3DCC%3DCC%3DC3C%3DC2 could not be loaded.