ERROR opening https://cactus.nci.nih.gov/chemical/structure/Cl.Cl.N%28CCNC%28c1ccccc1%29c2ccccc2%29C%28c3ccccc3%29c4ccccc4/file?format=sdf&get3d=True -- Cl.Cl.N%28CCNC%28c1ccccc1%29c2ccccc2%29C%28c3ccccc3%29c4ccccc4 could not be loaded.