ERROR opening https://cactus.nci.nih.gov/chemical/structure/CC%28%3DCCNC1%3DNC%3DNC2%3DC1NC%3DN2%29C/file?format=sdf&get3d=True  -- CC%28%3DCCNC1%3DNC%3DNC2%3DC1NC%3DN2%29C could not be loaded.