The crystal structure of the title compound (systematic name: 2-amino-1-methyl-4-oxo-4,5-dihydro-1H-imidazol-3-ium 3-phenylprop-2-enoate), C4H8N3O+&#183;C9H7O2&#8722;, is stabilized by N&#8212;H...O hydrogen bonding. Cations are linked to anions to form ion pairs with an R22(8) ring motif. These ion pairs are connected through a C22(6) chain motif extending along the c axis of the unit cell. This crystal packing is characterized by hydrophobic layers at x&#160;&#8764;&#160;1/2 packed between hydrophilic layers at x &#8764; 0
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