flepindolol, a potent 0-adrenoceptor blocking agent, was labelled with I 4 C by two different routes yielding the 2-PClmethyl and L-l4d products. While the first alternative was abandoned because o f low overall yield, the latter route provided mepindolol with a specific activity o f 2.06 GBq/rnmole (55.8 mCi/mmole) and in a radiochemical yield of 40% starting from Ba14C05.
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