So alcoholic fermentation to basically reform those NAD plus coenzyme molecules. And what happens is the pyruvate molecules ultimately are transformed into the ethanol molecule of this process actually takes place in two steps. The first step is a decarboxylation process and the enzyme that catalyzes this process is known as pyruvate decarboxylase. And so we begin with our pyruvate molecule and in the presence of an H plus ion as well as an important coenzyme known as thymine pyrophosphate, which actually is a thymine vitamin derivative. So thiamine is vitamin B one. So in the presence of this coenzyme, what will happen is this bond will be broken.