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The structure and the internal dynamics of the lactam 1,3-dimethyl-2-imidazolidinone, also known as N,N′-dimethylethyleneurea, have been investigated through the analysis of its free-jet absorption rotational spectrum. One conformer has been assigned. The pure μb-type spectrum, recorded in the 59.6–74.4GHz frequency range entails an inertial defect Δc=−16.39uÅ2, indicating that the molecule has C2...
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