ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%3DC%28N%28C1%3DCC%3DCC%3DC1%29C2CCNCC2%29CCC/file?format=sdf&get3d=True  -- O%3DC%28N%28C1%3DCC%3DCC%3DC1%29C2CCNCC2%29CCC could not be loaded.