2-(2-(Butylthio)2-methylpropylamino]-1-(2-mercapto-2-methylpropylamino)benzene → 2-Propanethiol, 1-anilino-2-methyl-

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2-(2-(Butylthio)2-methylpropylamino]-1-(2-mercapto-2-methylpropylamino)benzene was reacted with Tc-99m sodium pertechnetate by the method of Example 7 to produce Tc-99m complex of 2-(2-butylthio)2-methylpropylamino)-1-(2-mercapto-2-methylpropylamino)benzene. The complex was purified by filtration through Millex GS and Jelco 5 micron fitlers. HPLC (90% ethanol/H 2 O, 1.5 ml/min, C18 5 micron Radial Pak) Rt 4.4 min (99%). TLC (50% diethyl ether/chloroform) Rf 0.89, radiochemical purity 92%. Electrophoresis (0.05 M NaH2PO4, buffer pH 4.5 constant 300 volts, 30 min) neutral.

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