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Acetic anhydride is a potent chemical that poses significant health risks, which is why it would not be classified as less toxic. It is a reactive anhydride known for its corrosive properties, particularly affecting mucous membranes and skin, and can cause severe respiratory issues if inhaled. As a chemical commonly used in the synthesis of various acetyl compounds, its potential hazards in the laboratory setting are notable.

In contrast, Water is universally recognized as non-toxic and essential for life, while Hydrogen Peroxide, although it can be hazardous in concentrated forms, is typically considered less toxic at lower concentrations and is often used as a disinfectant. Trinitrotoluene (TNT), while toxic and considered an explosive, is fundamentally more dangerous than acetic anhydride in terms of acute exposure, but it does not have the same broad range of toxicological concerns associated with reactive chemicals in laboratory environments.