ERROR opening https://cactus.nci.nih.gov/chemical/structure/n1nn%28nc1%5CC2%3DC%5CCCN%28C%29C2%29CC/file?format=sdf&get3d=True  -- n1nn%28nc1%5CC2%3DC%5CCCN%28C%29C2%29CC could not be loaded.