A 5,6-dihydro-a-pyrone of formula (I) wherein R is CO 2 H or CH 3 and each of R<SP>1</SP> and R<SP>2</SP> is H; or R is CO 2 H, one of R<SP>1</SP> and R<SP>2</SP> is H and the other is OH; or when R is CO 2 H, a pharmaceutically or veterinarily acceptable salt thereof. Processes for producing compounds of formula (I) and their use as cytokine production inhibitors are also described.




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