Polyoxometalates (POMs) as a large family of metal-oxygen clusters of the early transition metals have attracted extensive attention owing to their properties [1-3]. The crystal engineering of inorganic–organic hybrid materials has become an intensively active field due to, not only the structural diversity, but also their promising applications in the fields of catalysis, medicine, magnetism, photochemistry and electrical chemistry [4-6]. As the coating of the viral particles is made up of proteins and the antiviral and anticancer properties of polyoxometalates have been shown, there has been a growing interest in the syntheses of POMs-protein hybrid. In this regards, chemical reactions of amino acids, as the building blocks of proteins, with POMs have been the focus of attention. So far, the adducts of mixed amino acids with [P2M18O62]n- have not been reported. In this research, we have synthesized for the first time, a novel inorganic-organic hybrid containing P2W18O626- and proline-aspargine amino acids. The title compound has been identified by spectroscopic methods. Obtained data prove that it has been synthesized, accurately. The IR spectrum of title compound exhibits a band at 1089 cm-1 attributed to ν(P–Oa) and characteristic bands at 956 cm-1 attributed to ν(W–Od), 906 and 786 cm-1 attributed to ν(W–Ob/c–W), respectively. The characteristic bands of the amino acids may be seen at 1243– 1772 cm-1 range. The peak at 1625 cm-1 may be assigned to the bending vibration of water molecules and the featured 2950-2980 cm-1

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