The presence of two turmerones in turmeric is demonstrated and their structures are defined as 2-methyl-6-(4-methylcyclohexa-2,4-dien-1-yl)hept-2-en-4-one (5, ‘α-turmerone’) and 2-methyl-6-(4-methylenecyclohex-2-en-1-yl)hept-2-en-4-one (2, ‘β-turmerone’).
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Golding et al. (1982) studied this question.