ERROR opening https://cactus.nci.nih.gov/chemical/structure/CCCN%28C1%3DCC%3DNC%3DC1%29N2C%3DCC3%3DCC%3DCC%3DC32/file?format=sdf&get3d=True -- CCCN%28C1%3DCC%3DNC%3DC1%29N2C%3DCC3%3DCC%3DCC%3DC32 could not be loaded.