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Previously unreported 15N labeled Azidothymidine (AZT) was prepared as an equimolar mixture of two isotopomers: 1‐15N‐AZT and 3‐15N‐AZT. Polarization decay of 15N NMR signal was studied in high (9.4 T) and low (~50 mT) magnetic fields. 15N T1 values were 45 ± 5 s (1‐15N‐AZT) and 37 ± 2 s (3‐15N‐AZT) at 9.4 T, and 140 ± 16 s (3‐15N‐AZT) at 50 mT. 15N‐AZT can be potentially 15N hyperpolarized by several...
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