{"knowledge_schema": {"broad_category": "Chemistry \u2192 Organic Chemistry \u2192 Structural Analysis", "refinement": "This problem involves analyzing spectral data (FTIR and NMR) to deduce the structure and molecular formula of an organic compound.", "specific_scope": "The task is to identify the correct molecular formula of a tri-substituted aromatic compound based on the provided spectral data and the number of signals in the NMR spectrum.", "goal": "Determine the correct chemical formula from the given options based on the analysis of functional groups and the number of hydrogen atoms present."}, "summary": "In this problem, we analyze the spectral data of a tri-substituted aromatic compound to identify its molecular formula. The FTIR spectrum indicates the presence of both ester and ketone functional groups, while the 1H NMR spectrum reveals eight signals corresponding to different types of hydrogen atoms. By considering the number of aromatic, vinyl, and methyl groups, as well as the absence of methylene groups, we deduce that the correct chemical formula is C15H16O3, which aligns with the observed spectral data."}