Thi video tells us about the de novo synthesis of purine together with the structures involved and the reaction and the enzymes taking part in the reaction. The steps involved and the summary of the reactions are provided in the end. TIMELINE: 0:01 Introduction 0:07 Ribose-5-phosphate 0:59 Synthesis in cell 1:35 ATPs utilized 2:49 Structures of purine in detail 3:00 Synthetic steps in detail 11:39 Summary 12:53 End