We begin with the activated Acyl units and the activated melonial units, or Malanol units. Now we take the activated melanol units, and we basically undergo a condensation reaction with this activated Acyl unit. And what that does is it helps us generate that sigma bond. And once we generate that sigma bond, we essentially generate that same molecule that we had in this particular case. The next process is a reduction step, because that's the opposite of this oxidation step. So we're going this way here, and that means we essentially want to add an extra number of electrons along with h atoms.