code: @Override
      public boolean setProductCoefficient(IAtomContainer product, Double coefficient) {
          boolean result = products.setMultiplier(product, coefficient);
          return result;
      }
docs: Sets the coefficient of a a product to a given value.
  
  @param   product     Product for which the coefficient is set
  @param   coefficient The new coefficient for the given product
  @return  true if Molecule has been found and stoichiometry has been set.
  @see     #getProductCoefficient