ERROR opening https://cactus.nci.nih.gov/chemical/structure/CO/N%3DC/C1%3DCCCN%28C1%29C%28%3DO%29OC2%3DCC%3DC%28C%3DC2%29Cl/file?format=sdf&get3d=True -- CO/N%3DC/C1%3DCCCN%28C1%29C%28%3DO%29OC2%3DCC%3DC%28C%3DC2%29Cl could not be loaded.