ERROR opening https://cactus.nci.nih.gov/chemical/structure/COC1%3DCC2%3DC%28C%3DC1%29C3%3DC%28N2%29C%3DNCC3/file?format=sdf&get3d=True  -- COC1%3DCC2%3DC%28C%3DC1%29C3%3DC%28N2%29C%3DNCC3 could not be loaded.