I think you have some deductible capital losses, that is the difference between the basis (the aggregate amount invested for the restricted stock that you paid through your regular payroll over the years) and market value (Zero, now that the company is bankrupt!).
You should be able to deduct as capital losses the entire value of the amount that you invested in the restricted stock, especially now since the company is bankrupt. Also, remember that fact that you were also taxed on the these restricted options.
I would certainly consult a CPA experienced in this arena as he can better calculate your correct basis and maximize your allowable capital losses from the bankruptcy of the company!