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Stocks on the move: PTT GLOBAL CHEMICAL PCL Shares in the petrochemical firm created by the merger of PTT Chemical Pcl and PTT Aromatics and Refining Pcl started trading at 56 baht. Broker DBS Vickers Securities rated the stock a 'buy', with a fair value of 78 baht. PTT Global, Thailand's biggest integrated petrochemical firm, would benefit from the 'upcycle' in the aromatics and olefins business expected from the second half of 2012, it said.