ERROR opening https://cactus.nci.nih.gov/chemical/structure/CC%28C%29NC%28%3DO%29CN1C%28%3DNN%28C1%3DO%29C2%3DCC%3DC%28C%3DC2%29CCN3CCOCC3%29C4%3DCC%28%3DCC%3DC4%29Cl/file?format=sdf&get3d=True -- CC%28C%29NC%28%3DO%29CN1C%28%3DNN%28C1%3DO%29C2%3DCC%3DC%28C%3DC2%29CCN3CCOCC3%29C4%3DCC%28%3DCC%3DC4%29Cl could not be loaded.