ERROR opening https://cactus.nci.nih.gov/chemical/structure/COC1%3DCC2%3DC%28NC%3DC2CCNC%28C%29%3DO%29C%3DC1/file?format=sdf&get3d=True  -- COC1%3DCC2%3DC%28NC%3DC2CCNC%28C%29%3DO%29C%3DC1 could not be loaded.