Fig. 10.

Two-dimensional ¹⁵N/¹³C HETCOR spectrum of the ¹³C_α, ¹⁵N labeled single crystal of N-acetyl leucine (¹³C_α, ¹⁵N NAL) obtained using the pulse sequence in Fig. 1e. Four scans for each of 90 t₁ points were acquired in the indirect dimension with a dwell of 50 µs. The ¹H decoupling field during the t₁ and t₂ intervals was 50 kHz. The recycle delay used for the experiment was 6 s.