Great job! I saw many internet posts (in Chinese only) talking about delivery format and the delivery ingredients. They in general claimed that the petented drugs all seem to have certain secret recipe in delivery (often taking Contac as an example to illustrate). The conclusion is that it is so difficult for generic manufacturer to product a drug of similar efficacy no matter how long the patent has expired and no matter what the actual chemical composition is, these non-NCE ingredients are trade secrets. I would appreciate if you could write a short memo clarifying this area, (and also, if possible, if all NCE are prone to quality/impurity issues?)