{"knowledge_schema": {"broad_category": "Chemistry \u2192 Organic Chemistry \u2192 NMR Spectroscopy", "refinement": "This problem involves interpreting NMR spectra to deduce structural information about organic compounds, specifically focusing on the connectivity of protons in a molecule.", "specific_scope": "The task is to analyze the 2D NOESY NMR spectra of two products derived from a reaction involving a dicarboxylic acid anhydride and a cyclopentadiene derivative, identifying which resonances are connected by a cross-peak in the major product.", "goal": "Determine the specific proton resonances in the major product that are correlated through NOE effects, indicating spatial proximity."}, "summary": "This problem requires understanding NMR spectroscopy, particularly 2D NOESY, to analyze the connectivity of protons in organic compounds. The scenario describes the reaction of a dicarboxylic acid anhydride with a cyclopentadiene derivative, leading to two products. The goal is to identify which two proton resonances in the major product are connected by a cross-peak in the NOESY spectrum, indicating they are in close spatial proximity. The correct answer is the 1H doublet at 1.5 ppm and the 2H singlet at 3.5 ppm."}