ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%3DC%28n1c2ccccc2nc1NC%28%3DO%29OC%29NCCCC/file?format=sdf&get3d=True  -- O%3DC%28n1c2ccccc2nc1NC%28%3DO%29OC%29NCCCC could not be loaded.