Product of the reaction between hexane‐2,5‐dione and ammonium carbonate
Heating $\ce{(NH4)2CO3}$ will generate $\ce{NH3 + CO2 + H2O}.$ Out of these, $\ce{NH3}$ will act as a nucleophile as it's the most nucleophilic of the products. Addition of $\ce{NH3}$ to the two ketones, followed by elimination of water molecules (due to the high temperature provided by ∆) will generate the final product as follows:



The product is a five-membered aromatic ring called 2,5-dimethylpyrrole.