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negative group▼noun[UK: ˈne.ɡə.tɪv ɡruːp] [US: ˈne.ɡə.tɪv ˈɡruːp]
acetyl [acetyls]▼noun[UK: ˈasɪtˌaɪl] [US: ˈæsɪtˌaɪl]
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