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The won came under further pressure from dollar demand from local importers for payments.
The Philippine peso fell on its overall weakness in non-deliverable forwards.
Earlier, data showed China retail sales in July grew less than expected and the amount of money flowing into the economy slowed to the lowest level in nearly six years, indicating more policy support may be necessary to keep growth on track.
Thailand's baht, however, rose on catch-up plays as local financial markets were closed on Monday and Tuesday when
most emerging Asian currencies gained.
Bangkok shares jumped more than 1 percent, well outpacing regional equity markets.