Structures of the covalent hydrates and products of acidic hydrolysis of rheumycin and fervenulin
It is shown that pyrimido[5,4-e]-1,2,4-triazinediones are hydrated at the N(4)-C(4a) bond in aqueous acidic media. The equilibrium constants of these processes were measured by PMR spectroscopy. The structure of the covalent adduct of fervenulin was established by x-ray diffraction analysis. Formic, 5-diazo-3-methylbarbituric, and methylparabanic acids were identified among the products of destruction of the hydrates in acidic media.