Statistics for Hydrogen bonding in crystal structures of N,N′-bis(3-pyridyl)urea. Why is the N-H⋯O tape synthon absent in diaryl ureas with electron-withdrawing groups?

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Hydrogen bonding in crystal structures of N,N′-bis(3-pyridyl)urea. Why is the N-H⋯O tape synthon absent in diaryl ureas with electron-withdrawing groups? 1

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