In glycolysis ultimately (or end product of glycolysis) is

In glycolysis ultimately (or end product of glycolysis) Glucose is converted into pyruvic acid. During glycolysis, glucose ultimately breaks down into pyruvate and energy; a total of 2 ATP is derived in the process.
Glucose + 2 NAD+ + 2 ADP + 2 Pi → 2 Pyruvate + 2 NADH + 2 H+ + 2 ATP + 2 H₂O.
The hydroxyl groups allow for phosphorylation. The specific form of glucose used in glycolysis is glucose 6-phosphate.