Abstract: A new highly oxygenated iridoid, lamiophlomiol C isolated from the al-cohol soluble fraction of the roots of Lamiophlomis rotata (Labiatae), was shown tohave the molecular formula C₁₁H₁₄0₇. On the basis of UV, IR, MS and NMRspectroscopic data, particularly X-ray crystallographlic analysis, structure I has beenassigned to this iridoid.