Gold prices gained while the U.S. dollar remained unchanged on Wednesday as investors awaited details of the U.S. Federal Reserve's two-day meeting due later in the day. SEE MORE Asia’s naphtha prices touched a four-month high at above $700/tonne in response to high crude oil futures, but a supply overhang will keep the market slightly bearish. SEE MORE Oil prices rose Tuesday on global supply concerns following U.S. sanctions on Iran’s oil exports, with benchmark Brent surging to a four-year high, then retraced gains to settle just slightly higher after U.S. President Donald Trump called again on OPEC to boost crude output. SEE MORE Brent crude was trading around its highest in nearly four years on Wednesday, while U.S. crude futures fell as Washington tried to assure consumers that the market would be well supplied before sanctions are re-imposed on producer Iran. SEE MORE China’s phenol import prices are at their highest in nearly four years on the back of tight supply due to a slew of shutdowns at major domestic facilities. SEE MORE