ERROR opening https://cactus.nci.nih.gov/chemical/structure/CCCCCCOC1%3DNSN%3DC1C2%3DCCCN%28C2%29C/file?format=sdf&get3d=True  -- CCCCCCOC1%3DNSN%3DC1C2%3DCCCN%28C2%29C could not be loaded.