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view 2-hydroxymethyl-4-hydroxy-5-methyl-3(2H)-furanone charred paper, unpleasant,

view 2-methoxy-3-acetyl-6-methylpyrazine chimney soot, unpleasant, weakly green,

view 2,5-dimethoxy-3-acetyl-6-methylpyrazine chimney soot, earthy, unpleasant, weakly green,