A compound containing sulfur, nitrogen, and hydrogen has 86.6% sulfur, 12.6% nitrogen, and 0.91% hydrogen. A 1.263-g sample of this compound was dissolved in 25.00 g of bromoform, producing a solution that freezes at 4.4°C. The solvent has a freezing point of 7.8°C. Kf for bromoform is 14.4°C/molal. What is the molecular formula for the compound?