ERROR opening https://cactus.nci.nih.gov/chemical/structure/CN%28C%29CCCN1C2%3DCC%3DCC%3DC2SC3%3DC1N%3DCC%3DC3/file?format=sdf&get3d=True -- CN%28C%29CCCN1C2%3DCC%3DCC%3DC2SC3%3DC1N%3DCC%3DC3 could not be loaded.