ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%3DC%28NO%29c1cnc%28nc1%29N2CCC%28CC2%29CNCc4c3ccccc3n%28c4%29C/file?format=sdf&get3d=True  -- O%3DC%28NO%29c1cnc%28nc1%29N2CCC%28CC2%29CNCc4c3ccccc3n%28c4%29C could not be loaded.