ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%3DC%28N%28C1CCN%28CC1%29CCc2ccccc2%29c3ccccc3%29c4occc4/file?format=sdf&get3d=True  -- O%3DC%28N%28C1CCN%28CC1%29CCc2ccccc2%29c3ccccc3%29c4occc4 could not be loaded.