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 {TAIL ~ a hydroxy or mercapto group} attached to the other carbon atoms of the ring structure 
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 { TAIL ~ a hydroxy or mercapto group } attached to the other carbon atoms of the ring structure
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH