With these tokens, the intent is to be able to describe hemoglobin, hexose kinase, lipoproteins, peptidoglycans, enzyme inhibitor complexes, and hopefully a wide variety of other structures. All of the structural information has been unified under the 'entity' umbrella. Is in publisher token, but I think would be useful on its own. I would recommend using Chemical Abstracts abbreviations for journals as a standard. Multimeric molecules are defined as macromolecules that have quaternary structure and are formed by the association of two or more subunits each of which may have various degrees of complexity.
Homogeneous molecules are either polymeric or non-polymeric.
Examples of non-polymeric molecules would include free amino acids, enzyme prosthetic groups, substrates, inhibitors, and other small molecules. For instance, insulin, CD2, and erythropoietin.