ERROR opening https://cactus.nci.nih.gov/chemical/structure/CC1%3DC2NC3%3DCC%28%3DO%29C%3DCC3%3DC2C%3DCN1/file?format=sdf&get3d=True  -- CC1%3DC2NC3%3DCC%28%3DO%29C%3DCC3%3DC2C%3DCN1 could not be loaded.