{"knowledge_schema": {"broad_category": "Chemistry \u2192 Organic Chemistry \u2192 Spectroscopy", "refinement": "This problem involves interpreting NMR (Nuclear Magnetic Resonance) spectra 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 interpretation of 1H and 2D NOESY spectra to deduce structural relationships in organic compounds. The task is to identify which two resonances in the major product's spectrum are connected by a cross-peak, indicating spatial proximity. The correct answer is the 1H doublet at 1.5 ppm and the 2H singlet at 3.5 ppm, suggesting these protons are in close proximity in the molecular structure."}