ERROR opening https://cactus.nci.nih.gov/chemical/structure/COC1%3DC2C%3DCC%28%3DO%29OC2%3DCC3%3DC1C%3DCO3/file?format=sdf&get3d=True  -- COC1%3DC2C%3DCC%28%3DO%29OC2%3DCC3%3DC1C%3DCO3 could not be loaded.