ERROR opening https://cactus.nci.nih.gov/chemical/structure/N%5C1%3DC%5Cc3c%28Oc2c/1cccc2%29cccc3/file?format=sdf&get3d=True  -- N%5C1%3DC%5Cc3c%28Oc2c/1cccc2%29cccc3 could not be loaded.