Rhizobialide: A New Stearolactone Produced by Mesorhizobium sp. CCNWGX022, a Rhizobial Endophyte from Glycyrrhiza uralensis

The endophytic strain Mesorhizobium sp. CCNWGX022 was isolated from licorice (Glycyrrhiza uralensis Fisch.) grown in the arid and semi‐arid regions of Northwest China. The new stearic acid derived γ‐lactone 1, named rhizobialide (=(5S)‐4,5‐dihydro‐5‐(8‐oxotetradecyl)furan‐2(3H)‐one), was isolated from the petroleum‐ether extract of the fermentation broth of this strain. The structure of 1 was elucidated on the basis of spectroscopic and mass‐spectrometric analysis. This is the first report of this type of compound from rhizobia.

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