When 2,2-dibromo-1-phenylpropane is heated overnight with sodium amide at 150C, the major product (after addition of water)

Question:

When 2,2-dibromo-1-phenylpropane is heated overnight with sodium amide at 150°C, the major product (after addition of water) is a different foul-smelling compound of formula C9H. Propose a structure for this product, and give a mechanism to account for its formation.