So this bond between the nitrogen and the carbon was essentially cleaved in this step as described here. And so in the final step, this carboxylic acid product basically departs. It leaves the active side. And once it leaves the active side, it basically prepares the active side for another cycle of hydrolysis. So this is the reaction mechanism that actually takes place inside the active side of Chimotryptin. And so the important point about this mechanism is inside the active side we have this catalytic triad, this collection of amino acids which basically work together to create a strong nuclear file.