By Abhijit Neogy and Alexei Anishchuk

SANYA, China (Reuters) - The BRICS group of emerging-market powers kept up the pressure on Thursday for a revamped global monetary system that relies less on the dollar and for a louder voice in international financial institutions.

The leaders of Brazil, Russia, India, China and South Africa also called for stronger regulation of commodity derivatives to dampen excessive volatility in food and energy prices, which they said posed new risks for the recovery of the world economy.

Meeting on the southern Chinese island of Hainan, they said the recent financial crisis had exposed the inadequacies of the current monetary order, which has the dollar as its linchpin

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