ERROR opening https://cactus.nci.nih.gov/chemical/structure/COC1%3DC2C%28%3DC%28C3%3DC1OCC3%29CCN%29CCO2/file?format=sdf&get3d=True  -- COC1%3DC2C%28%3DC%28C3%3DC1OCC3%29CCN%29CCO2 could not be loaded.