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Synthesis of 5-ethyl-2-{5-[4-(2-hydroxyethyl)piperazin-1-ylsulfonyl]-2-n- propoxyphenyl}-7-n-propyl-3,5-dihydro-4H-pyrrolo[3,2-d]-[2-14C] pyrimidin-4-one · 2 HCl (14C-SK3530 · 2 HCl)