Discussion highlights the quality of opendata resources like NMRShiftDB, suggesting potential improvements.
Lately, Chemical blogspace has seen an interesting discussion on the quality of opendata and free chemical database (over 32 free resources now ), such as the NMRShiftDB.org. For example, see Antony's view on the NMRShiftDB and Robien's analysis.
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Egon Willighagen (2007) studied this question.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: