ERROR opening https://cactus.nci.nih.gov/chemical/structure/CC1%3DNCCC2%3DC1NC3%3DC2C%28%3DCC%3DC3%29OC/file?format=sdf&get3d=True  -- CC1%3DNCCC2%3DC1NC3%3DC2C%28%3DCC%3DC3%29OC could not be loaded.