ERROR opening https://cactus.nci.nih.gov/chemical/structure/CC1%3DCC2%3DC%28C%3DC1N%29SC3%3DCC%28%3DN%20%28C%29C%29C%3DCC3%3DN2.Cl-/file?format=sdf&get3d=True -- CC1%3DCC2%3DC%28C%3DC1N%29SC3%3DCC%28%3DN%20%28C%29C%29C%3DCC3%3DN2.Cl- could not be loaded.