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Logic Puzzle #11: Pairwise Correlation Confidence

Typical for long range 2D NMR experiments, spectral data may exhibit more than one correlation for two coupled nuclei (e.g. A to B and B to A). The pairwise correlations offer an extra degree of confidence in the interpretation.  

For the following fragment, an 1H-13C HMBC correlation exists for the 1H 2.15 ppm to 13C 84.7 ppm (represented by the purple arrow in the diagram below).

Logic#11HMBCMissingCorrelation_HMBC1_Jan 
Is the pairwise correlation for the 1H 5.31 ppm to 13C 21.1 ppm evident?

Logic#11HMBCMissingCorrelation_HMBC2_Jan42011 
A special thanks goes to Gene M. for pointing me to the data.