South Korea based YNCC has purchased heavy stock of naphtha to be arrived in the first half of June at heavy discounted levels. This is the steepest discount in S Korea in a month, as per traders. Recently LG Chem and Hanwha Total had purchased a total of 100,000 tones of the fuel for H1-June delivery at a narrower discount of US$1-1.50/ton to Japan quotes on a C&F basis.