organic compounds
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A charge-assisted hydrogen-bonding network involving N—HO and O—HO hydrogen bonds stabilizes the crystal of the title salt, C5H8N3+·H2PO4−. The dihydrogen phosphate anions form one-dimensional chains along [100], via O—HO hydrogen bonds. The 2-amino-4-methylpyrimidinium cations are linked to these chains by means of two different kinds of N—HO hydrogen bonds. Neighbouring chains are linked via C—HN and C—HO hydrogen bonds forming two-dimensional slab-like networks lying parallel to (01-1).