Hi all, Is there any way to select (or directly remove) atoms without substituents? The situation is that I have to cut a region of a system. So, after selecting by zone *without* including the entire residues, I save the selection and I get some single atoms that I would like to get rid of. For example, in the attached file I got H atoms, C atoms, and also C2 chains that do not have any sense even if I complete their valences by adding H. Notice that in such a way they will become H2, CH4 and CH3CH3, respectively, which are very strange molecules for my system that actually contains phospholipids, ibuprofen, and water. I would like to know if there is any automatic tool to do it, for example defining an attribute or using the command line. Any help is appreciated. Regards, Sara