[{"from": "human", "value": "Provide a description of this molecule. [C][=C][C][=C][Branch1][Branch1][C][=C][Ring1][=Branch1][C][=Branch1][C][=O][C][Br]"}, {"from": "gpt", "value": "The molecule is an organobromide compound. It is a powerful lachrymator as well as a useful precursor to other organic compounds. In particular, henacyl bromide can be used for the identification of organic acids via their conversion to crystalline phenacyl esters. Phenacyl bromide can also be used for the determination of global DNA methylation by reversed phase HPLC with spectrofluorimetric detection. It has also been used as a protein modification or labeling agent for the selective modification of cysteine residues in a number of enzymes for biochemical studies. It is a white solid that reacts slowly with metals causing mild corrosion.  It is combustible and may burn but does not ignite readily. When heated, vapors may form explosive mixtures with air."}]