ERROR opening https://cactus.nci.nih.gov/chemical/structure/N%5C1%3DC%28%5CNCC/1%29C3c2ccccc2CCC3/file?format=sdf&get3d=True -- N%5C1%3DC%28%5CNCC/1%29C3c2ccccc2CCC3 could not be loaded.