ERROR opening https://cactus.nci.nih.gov/chemical/structure/C1CN%28CCN1CC2%3DCC3%3DC%28C%3DC2%29OCO3%29C4%3DNC%3DCC%3DN4/file?format=sdf&get3d=True  -- C1CN%28CCN1CC2%3DCC3%3DC%28C%3DC2%29OCO3%29C4%3DNC%3DCC%3DN4 could not be loaded.