ERROR opening https://cactus.nci.nih.gov/chemical/structure/CCCNC%28C%29%28C%29COC%28%3DO%29C1%3DCC%3DCC%3DC1/file?format=sdf&get3d=True  -- CCCNC%28C%29%28C%29COC%28%3DO%29C1%3DCC%3DCC%3DC1 could not be loaded.