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US May maleic anhydride prices move up by 1%. Ken Fountain. HOUSTON (ICIS)--May contract prices for US maleic anhydride (MA) moved higher by 1% from April, sources confirmed on Tuesday. MA prices are assessed by ICIS at 92.20-98.20 cents/lb ($2,033-2,165/tonne, €1,545-1,645/tonne) -Reported by ICIS.