ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%3DC%28C%29OCC%28%3DO%29NCCCOc1cccc%28c1%29CN2CCCCC2/file?format=sdf&get3d=True  -- O%3DC%28C%29OCC%28%3DO%29NCCCOc1cccc%28c1%29CN2CCCCC2 could not be loaded.