ERROR opening https://cactus.nci.nih.gov/chemical/structure/COCCOC1%3DC%28C%3DC%28C%3DC1OC%29CC2%3DCN%3DC%28N%3DC2N%29N%29OC/file?format=sdf&get3d=True  -- COCCOC1%3DC%28C%3DC%28C%3DC1OC%29CC2%3DCN%3DC%28N%3DC2N%29N%29OC could not be loaded.