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The acyclic nucleoside phosphonate (ANP2−) 9-[2-(phosphonomethoxy)ethyl]guanine (PMEG) is anticancer and antivirally active. The acidity constants of the threefold protonated H3(PMEG)+ were determined by potentiometric pH titrations (aq. sol.; 25°C; I=0.1M, NaNO3). Under the same conditions and by the same method, the stability constants of the binary Cu(H;PMEG)+ and Cu(PMEG) complexes as well as...
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