{"knowledge_schema": {"broad_category": "Chemistry \u2192 Organic Chemistry \u2192 Stereochemistry", "refinement": "This problem involves identifying optically active compounds based on their stereochemistry and the presence of chiral centers.", "specific_scope": "The task is to analyze a list of organic compounds to determine which ones possess chirality, leading to optical activity.", "goal": "Count the number of optically active compounds from the provided list."}, "summary": "In this problem, we are tasked with determining the number of optically active compounds from a given list. Optically active compounds are those that have at least one chiral center, which allows them to rotate plane-polarized light. By analyzing each compound for chirality, we find that three of the compounds in the list are optically active, leading to the conclusion that the answer is 3."}