Diterpene compound

Patent Pending PROBLEM TO BE SOLVED: To provide a new cytokine production control agent, and to provide a medicine for preventing or treating various diseases caused by the abnormal production of cytokine and the depression of immunity. ; SOLUTION: This medicinal composition or cytokine production control agent contains a diterpene compound represented by formula (1) (wherein, R<SB>1</SB>is a 1 to 6C acyl, or a 1 to 6C hydrocarbon group; R<SB>2</SB>is a 1 to 6C alkoxycarbonyl, a 1 to 6C acyl, or a 1 to 6C hydrocarbon group; Ra, Rb and Rc are each independently a 1 to 6C hydrocarbon group).