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(A) 2D NCO and DQSQ spectra acquired using conventional methods (Figure 1S). (B) NCO and DQSQ spectra acquired simultaneously using DUMAS-DQSQ-NCO. DQSQ and DUMAS-DQSQ are drawn at the same noise level. To account for 20 % signal loss of 15N during SIM-CP, DUMAS-NCO is plotted with 1.25 times higher scale compared to NCO.
