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A procedure for the synthesis of a11C‐labeled oligopeptide containing [1‐11C]1,2,3,4‐tetrahydro‐β‐carboline‐3‐carboxylic acid ([1‐11C]Tpi) from the corresponding Trp•HCl‐containing peptides has been developed involving a Pictet‐Spengler reaction with [11C]formaldehyde. The synthesis of [1‐11C]Tpi from Trp and [11C]formaldehyde was examined as a model reaction with the aim of developing a facile and...
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