d-ribose is a pentosis (a sugar with a basic structure made of five carbon atoms), which naturally occurs in the human body. D-ribosis is not only part of the backbone of the DNA, but also part of ATP, the universal energy storage tank of living organisms. Dribosed ribosis is pentosis (a sugar with a basic structure of five carbon atoms), which occurs naturally in the human body. D-ribosis is not only part of the backbone of the DNA, but also part of ATP, the universal energy storage facility of living organisms.