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. This H plus will basically create a bond here while this carbon dioxide molecule shown in blue will be released into the environment in the gas form. So we have this CO2 molecule in the gas form and we have this molecule basically this entire structure plus this H. And this is known as acetyl aldehyde. Now, this is the first step.