(ă-den'ō-sēn fos'fāt fos'fō-sūl'fāt), An intermediate in the formation of urinary ethereal sulfates, notable for containing a "high-energy" sulfate bond; the 3'-OH of adenosine is replaced by -OPO3H2 and the 5'-OH by -OP(O2H)-OSO3H. Synonym(s): active sulfate