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Pyrazines and similar nitrogenous chemicals fall, for the most part, into three main odor categories: roasted, peanut or popcorn. They also sometimes display a mixture of these three notes. 5-Methyl-6,7-dihydro-5H-cyclopentapyrazine (FEMA# 3306, CAS# 273747-48-0) is no exception. It combines elements of the roasted and peanut categories with an added hint of an earthy note.
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