Short for diethylphosphoramidic acid; a rare chemical compound used in specialized industrial or research applications.
Acronym formed from the chemical compound name diethylphosphoramidic acid, where di- means two, ethyl refers to the ethyl group, phosphoramidic relates to phosphorus and amide compounds.
DEPA is such a specialized chemical that most chemists never work with it—it's one of thousands of obscure compounds catalogued in chemical databases that exist mainly for niche industrial or academic research.
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