[CPDC] Announcement of setting the merger baseline date with 100% subsidiary Zhao Xin Chemical

1. Date of original announcement: 2025/12/11 2. Summary of original announcement: The board of directors approved the merger with its 100%-owned subsidiary Zhao Xin Chemical Industry Co., Ltd. on Dec 11, 2025. The original merger baseline date was set for Feb 1, 2026. It was later adjusted to April 1, 2026, on Jan 29, 2026. On March 23, 2026, due to ongoing operational procedures, the baseline date was delayed again to be determined later based on actual progress. 3. Reason for change and main content: In coordination with relevant operations and schedule planning, the merger baseline date is now set for June 1, 2026. 4. Impact on company finance and business after change: None. 5. Other matters to be specified: None.