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d,l-hexamethylpropyleneamine oxime (HM-PAO) is well known to be the effective isomer when HM-PAO is used as a radiopharmaceutical. Its diastereoisomeric purity is of great importance because meso-impurity decreases the concentration of the 99m Tc-complex in the brain. The described investigation shows that 13 C-NMR spectroscopy is a suitable analytical method for the...
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