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Acetyl (Ia) and pivaloyl (Ib) triesters of the 1N,3N,5N-trihydroxy-1,3,5-triazin-2,4,6[1H,3H,5H]-trione (I) were synthesised. The spectrophotometric and potentiometric investigation of I revealed a weak acidic properties of triprotonic acid (pK a1 =5.23, pK a2 =6.32, and pK a3 =7.93). The MS and TGA analyses of I indicated on hydroxyisocyanate as possible degradation product...