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BHT (food grade, ⩾ 99 %), MEN (natural source, food grade, ⩾ 99 %) and MeOH (99. perumahan pir 99 pemalang 8 %) were purchased from Merck, while EtOH (⩾ 99. nox stuck di 99 5 %) was purchased from Carlo Erba Reagents S r l The BHT:MEN 1:3 mixture was prepared by mixing the components at the desired molar ratio and then heating at 323 K until a colorless and viscous liquid was