ERROR opening https://cactus.nci.nih.gov/chemical/structure/CC1%3DC%28SSC1%3DS%29C2%3DNC%3DCN%3DC2/file?format=sdf&get3d=True  -- CC1%3DC%28SSC1%3DS%29C2%3DNC%3DCN%3DC2 could not be loaded.