Explain how do you write the correct complex ion for this

Question

After conducting tests using the CuSo₄*5H₂O as a reagent, results show that the new compound synthesized contains the following elements:

- 13.07%   sulfur

- 22.85%   nitrogen

- 25.78%   copper

- 5.72%     hydrogen

- 32.58%   oxygen

1. Explain how do you write the correct complex ion for this?

2. Determine the structural formula of this compound and why?