ERROR opening https://cactus.nci.nih.gov/chemical/structure/CC%28NCC%28O%29COC1%3DC%28C%3DCC%3DC2%29C2%3DCC%3DC1%29C/file?format=sdf&get3d=True -- CC%28NCC%28O%29COC1%3DC%28C%3DCC%3DC2%29C2%3DCC%3DC1%29C could not be loaded.