ERROR opening https://cactus.nci.nih.gov/chemical/structure/N%5C1%3DC%28%5CNCC/1%29CN%28c2ccccc2%29Cc3ccccc3/file?format=sdf&get3d=True  -- N%5C1%3DC%28%5CNCC/1%29CN%28c2ccccc2%29Cc3ccccc3 could not be loaded.