ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%3DC%28Nc1cccc%28c1%29c2ccccc2%29OC3CCCCC3/file?format=sdf&get3d=True  -- O%3DC%28Nc1cccc%28c1%29c2ccccc2%29OC3CCCCC3 could not be loaded.