I'm interested in finding structures in CSD that contain two or more molecules that are different in protonation state only, e.g. contain both neutral molecule of an acid and mono-anion of an acid. However, I don't want to limit search only to acids, but to include all compounds. So the molecules belonging to the same structure should have the same connectivity but to differ in one hydrogen atom.
Does anyone have suggestion how this search could be done?
Thank you in advance,