The last area of applications of Gromologist covers extracting information about the topologies and structures, or making it better visible to the user. On the most basic level, one can list molecules in the system, atoms in the molecule, as well as selected bonded terms (bonds, 1-4 pairs, angles, dihedrals) using atom names or atom types. Charges and masses of both the whole system and individual molecules are easy-to-access attributes. For a protein or a nucleic acid structure, the sequence can be printed chain by chain, and per-residue missing atoms identified, helping identify cases in which residues have to be rebuilt. Gradually diagnostic functions are being incorporated to quickly identify structural issues prior to simulation, like one currently allowing for validation of all chiral centres in a protein.