| 摘要 |
The present invention encompasses compounds I and II, mixtures of I and II and acid addition salts thereof wherein R is hydrogen or loweralkyl having 1-3 carbon atoms, as well as compounds wherein the phenol moiety is labeled with 125I or 131I. The radiolabeled compounds are useful in radiochemical assaying for folic acid. <IMAGE> I <IMAGE> <IMAGE> II <IMAGE>
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