Two substances, P1 and P2, have been isolated from the ammonium bicarbonate solutions of adenylylsulfate and 3′- phosphoadenylylsulfate, respectively. Using radiochemical, spectroscopic, chromatographic and enzymatic methods it could be shown that P1 was identical to adenosine 5′- monophosphoramidate and that P2 was a closely related phosphorylated derivative of the same substance, namely 3′-phosphoadenosine 5′-monophosphoramidate.
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