[{"from": "human", "value": "What can you tell me about this molecule? [C][C][=C][C][=Branch1][=Branch1][=C][C][=C][Ring1][=Branch1][C][Br]"}, {"from": "gpt", "value": "The molecule is a poisonous organic chemical compound, formerly used as a tear gas. Physically it is a colourless liquid (melting point 21 \u00b0C) with a pleasant aromatic odour. m-Xylyl bromide is highly toxic, irritant and lachrymatory, and has been incorporated in chemical weapons since the early months of World War I. The first extensive use of xylyl bromide was the firing by German forces of 18,000 \"T-shells\" at Russian positions in the Battle of Bolim\u00f3w in January 1915. In the absence of clarification, the name \"xylyl bromide\" may refer to any one of 3 xylyl isomers (o-Xylyl, p-Xylyl, m-Xylyl) or a mixture of all three."}]