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The spectral widths were 7788 and 21,135 Hz for the 1 H and 13 C dimensions, respectively. The number of collected complex points was 1536 for the 1 H dimension, with a recycle delay of 1.5 or 2.5 s. The number of transients was 16 or 32, and 256 time increments were always recorded in the 13 C dimension.