What is the molecular formula of the solute

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Problem- A compound contains 42.9% C, 2.4% H, 16.6% N, and 38.1% O by mass. The addition od 3.16g of this compound to 75 mL of cyclohexane (d= 0.779g/ml) gives a solution with a freezing point of 0.0 degrees Celsius. The normal freezing pt of cyclohexane is 6y.50 degrees Celsius and its freezing pt depression constant of 20.2 degrees Celsius/m. what is the molecular formula of the solute?

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