ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%28c1ccc%28cc1%29CN%28c2ncccc2%29CCN%28C%29C%29C/file?format=sdf&get3d=True  -- O%28c1ccc%28cc1%29CN%28c2ncccc2%29CCN%28C%29C%29C could not be loaded.