{TAIL ~ Novel sulphur} containing food flavor substances are provided containing an oxygen or sulphur atom in {HEAD ~ a five membered ring structure}, at least one alkyl group at one of the carbon atoms adjacent to the hetero atom and having a keto oxygen and a hydroxy or mercapto group attached to the other carbon atoms of the ring structure 
{ TAIL ~ Novel sulphur } containing food flavor substances are provided containing an oxygen or sulphur atom in { HEAD ~ a five membered ring structure } , at least one alkyl group at one of the carbon atoms adjacent to the hetero atom and having a keto oxygen and a hydroxy or mercapto group attached to the other carbon atoms of the ring structure
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