An example of these successfully synthesised molecules is glucosinolate, an active pharmaceutical ingredient of multiple Chinese medicines, which are antibacterial, antioxidant, anticarcinogenic, etc. We illustrate the following 7-step synthetic route of glucosinolate in Scheme 1, suggested by the policy model. The cost of making glucosinolate in this route is 3.66, with five building block used. The depth of the longest branch is 7 steps. The route uses four organic chemical reactions and four synthetic biological reactions. Excluding free metabolites and cofactors such as NADPH, NADP+, oxygen, etc., the route produces in total three side products -UDP, pyruvate and carbapen-2-em-3-carboxylate; adenosine-3', 5'biphosphate from the first biological reaction (RxnBio0) is a coenzyme circulating over cell organisms, and thus, it is not strictly a side product. To compare, there is no chemical route to synthesise this molecule, and the cost of the purely biological route is 7.15.