Thanks for the clarification. Perhaps in future versions this facility could be considered? To illustrate why this is important (at least to me) is this: I have a long list of common chemical entities and I want to pull their crystal structures (if they exist) and then do additional calculations (such as lattice energies) using interfaces with other program packages (such as materials studio). Now, I want to do this in an automated fashion so the search could be done on "name", "smiles string" or any other type of identifier (except of course the CSD identifier since I do not have prior knowledge of it). The problem with doing a substructure search or a name search is that there are far too many hits to go through and find the correct structure for simple chemical entities. For example, finding if a crystal structure of THF exits gives >20,000 hits alone when you do a name search, benzene is similar. In my case I have a list of 1000+ chemicals this quickly becomes difficult to handle.