JPMorgan analyst Jeffrey Zekauskas says Monsanto (MON) shares are mispriced and offer an attractive risk/reward proposition. A first catalyst for the shares would be regulatory agreement in the Dow Chemical (DOW)/DuPont (DD) transaction, Zekauskas tells investors in a research note. The analyst thinks a favorable resolution to the Dow/DuPont merger would be seen as improving the probability of the success of the Bayer/Monsanto transaction. He notes that Bayer has agreed to purchase Monsanto for $128 per share in cash, which represents 21% appreciation potential should the deal close by year-end. Zekauskas thinks a "reasonable floor" price for Monsanto shares, should the deal fail, is $102. He keeps an Overweight rating on the name with a $128 price target.