comment "Definition: Stoichiometric coefficient of a physical entity in the context of a conversion or complex.
Usage: For each participating element there must be 0 or 1 stoichiometry element. A non-existing stoichiometric element is treated as unknown.
This is an n-ary bridge for left, right and component properties. Relative stoichiometries ( e.g n, n+1) often used for describing polymerization is not supported." (string)