ERROR opening https://cactus.nci.nih.gov/chemical/structure/C1%3DCC%3DC%28C%3DC1%29N%3DNC2%3DC%28C%3DC%28C%3DC2%29N%29N.Cl/file?format=sdf&get3d=True -- C1%3DCC%3DC%28C%3DC1%29N%3DNC2%3DC%28C%3DC%28C%3DC2%29N%29N.Cl could not be loaded.