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  1. Oxford Dictionary

    nor-

    • pref.
      denoting an organic compound derived from another, in particular by the shortening of a chain or ring by the removal of one methylene group or by the replacement of one or more methyl side chains by hydrogen atoms
    • 釋義

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    • 1. denoting an organic compound derived from another, in particular by the shortening of a chain or ring by the removal of one methylene group or by the replacement of one or more methyl side chains by hydrogen atoms noradrenaline