ERROR opening https://cactus.nci.nih.gov/chemical/structure/CC1%28C%29NCC%28OC1%29C2%3DCC%3DCC%3DC2/file?format=sdf&get3d=True  -- CC1%28C%29NCC%28OC1%29C2%3DCC%3DCC%3DC2 could not be loaded.