7 kcal/molj decrease in free energy (DG) under standard condition is called high energy compound, i.e., DG >- 7 Kcal/mol. For example, ATP liberates 7.3 Kcal/mol on hydrolysis. High energy compounds are : -Phosphate compounds : Nucleotides (ATP Q, GTP, UTP, UDP-glucose), Creatinine phosphate Q, arginine phosphate, 1,3-bisphosphoglycerate, Phosphoenol pyruvate, inorganic pyrophosphate, Carbamoyl phosphate0,amino acyl adenylate (amino acyl AMP).Sulfur compounds : - CoA derivatives (acetyl Co A Q. Succinyl CoA, fatty acyl CoA, HMG CoA), S-adenosvl methionine (SAM), adenosine phosphosulfate.o A compound which liberates < 7 Kcal/mol on hydrolysis is called low energy compound, i.e., a decrease in free energy' is < 7 Kcal/mol, i.e., AG < -7 Kcal/mol. Low energy' compounds are glucose-1-phosphate, fructose-6- phosphate, glucose-6-phosphate, glycerol-3-phosphate, AMP, ADP Q.">