ATP stands for adenosine triphosphate. The bond between the second phosphate group and the third phosphate group is a high energy bond. When this bond undergoes hydrolysis, the bond is broken and energy is released. After losing the terminal phosphate group, the remaining molecule is called diphosphate. To recharge Adenosine Diphosphate back into ATP, the cell typically catabolize or break down a six-carbon molecule called .