{"index": {"name": "Chemicals", "level": "industry", "country_code": "CN", "sector": "Basic Materials", "industry": "Chemicals", "constituent_count": 184, "latest": {"week_ending": "2026-05-29", "index_value": 2061.46695039, "weekly_return": -6.32503892, "constituents": 184, "advancing": 27, "declining": 155, "unchanged": 2, "trend_line": 2062.082441, "activity_lines": {"activity_5": 2167.645846, "activity_10": 2163.696877, "activity_20": 2152.101079, "activity_30": 2117.155002}, "fair_value": 1547.058841, "trend_signal": 1}, "summary": "For the week ending 29 May 2026, Chemicals declined 6.33% with 27 advancing, 155 declining, and 2 unchanged constituents.", "links": {"chart": "https://sharemaestro.com/structure/cn/basic-materials/chemicals/", "api": "https://sharemaestro.com/api/structure/cn/basic-materials/chemicals/", "share_image": "https://sharemaestro.com/structure/cn/basic-materials/chemicals/share-image.svg"}}, "available": true, "methodology": {"country_code": "CN", 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