ERROR opening https://cactus.nci.nih.gov/chemical/structure/%5B2H%5DC%28%5B2H%5D%29%28CN%29c1cc%28OC%29c%28OC%29c%28OC%29c1/file?format=sdf&get3d=True -- %5B2H%5DC%28%5B2H%5D%29%28CN%29c1cc%28OC%29c%28OC%29c%28OC%29c1 could not be loaded.