Sumod George’s favorite structure is:

N-4-iodophenyl-N′-4′-nitrophenylurea

Iodo nitro urea

Source: RSC

Why?

The crystal structure of  N-4-iodophenyl-N′-4′-nitrophenylurea is special. This was the most important crystall structure in my PhD thesis. Here it is the weak interaction that is dominating the strong interaction in the crystal lattice. —Sumod George

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