Copper futures fall on Shanghai Futures Exchange as "the LME 3-month contract looks vulnerable to further downside with support at 4,900 to 5,000 dollars," says Hu Bin, analyst at Yong'an Futures; notes strong domestic cash market may prevent SHFE prices falling as much as LME, though. Benchmark April contract at CNY49,790/ton, down CNY290; LME 3-month metal at $5,360, +$25 from PM kerb.