ERROR opening https://cactus.nci.nih.gov/chemical/structure/CCN%28CC%29C%28%3DS%29SSC%28%3DS%29N%28CC%29CC/file?format=sdf&get3d=True  -- CCN%28CC%29C%28%3DS%29SSC%28%3DS%29N%28CC%29CC could not be loaded.