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Why does diethylmethylamine have such a low melting point?

According to PubChem, diethylmethylamine has a remarkably low melting point of $-196.0^\circ$ C. This is substantially lower than the melting points of dimethylethylamine ($-140.0^\circ$ C), trimethylamine ($-117.1^\circ$ C), triethylamine ($-114.7^\circ$ C), and 3-methylpentane (given as both $-162.9^\circ$ and $-118^\circ$ C, not sure which is right). Why is that? Is diethylmethylamine uniquely ill-suited to forming a […]