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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 stable crystal lattice for some reason (maybe its highly asymmetric structure)?