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2.5
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benzodiazepine noun [ ˌbɛnzəʊdʌɪˈeɪzɪpiːn ]

• any of a class of heterocyclic organic compounds used as tranquillizers, such as Librium and Valium.
Origin: 1930s: from benzene + di-1 + azo- + epi- + -ine4.

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