{"knowledge_schema": {"broad_category": "Chemistry \u2192 Organic Chemistry \u2192 Stereochemistry", "refinement": "This problem involves identifying optically active compounds based on their molecular structure and stereochemistry.", "specific_scope": "The task is to analyze a list of chemical compounds to determine which ones possess chirality, leading to optical activity.", "goal": "Identify the number of compounds in the list that are optically active due to the presence of chiral centers."}, "summary": "In this problem, we are tasked with identifying optically active compounds from a given list. Optically active compounds are those that have chiral centers, which allow them to rotate plane-polarized light. By analyzing the structures of the provided candidates, we can determine which ones are chiral and thus optically active. The answer indicates that there are three such compounds in the list."}