C([O:8][CH2:9][CH:10]1[CH2:21][NH:20][CH2:19][CH:18]([CH2:22][O:23]CC2C=CC=CC=2)[NH:17][CH2:16][CH2:15][S:14][CH2:13][CH2:12][NH:11]1)C1C=CC=CC=1.C([O-])=O.[NH4+]>CO.[Pd]>[OH:23][CH2:22][CH:18]1[CH2:19][NH:20][CH2:21][CH:10]([CH2:9][OH:8])[NH:11][CH2:12][CH2:13][S:14][CH2:15][CH2:16][NH:17]15,9-Bis (benzyloxymethyl) -1-thia-4,7,10-triazacyclododecane (0.28 g, 0.65 mmol) was dissolved in methanol (10 ml). Ammonium formate (0.39 g) and 10% Palladium on carbon (1.3 g) were added under nitrogen and the mixture was stirred at 50° C. for 16 hours. The catalyst was filtered off and washed with methanol (5 ml). The filtrate was evaporated and 5,9-bis(hydroxymethyl)-1-thia-4,7,10-triazacyclododecane was isolated as a white solid. Mp. 210°-220° C. (subl.). Yield: 0.099 g (61%).
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