{"knowledge_schema": {"broad_category": "Chemistry \u2192 Organic Chemistry \u2192 Spectroscopy", "refinement": "This problem involves interpreting NMR spectroscopy data to deduce structural information about organic compounds.", "specific_scope": "The focus is on analyzing the 1H and 2D NOESY NMR spectra of reaction products derived from a dicarboxylic acid anhydride and a cyclopentadiene derivative.", "goal": "Identify the specific resonances in the major product's NMR spectrum that are connected by a cross-peak in the NOESY spectrum."}, "summary": "This problem requires understanding NMR spectroscopy, particularly the significance of cross-peaks in 2D NOESY spectra, which indicate spatial proximity between protons in a molecule. The task is to determine which two resonances in the major product's spectrum are connected by a cross-peak, suggesting they are close in space. The correct answer is the 1H doublet at 1.2 ppm and the 2H singlet at 3.8 ppm, indicating a spatial relationship that is significant in the structure of the major product."}