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Sir: In a previous paper" the presence of tetrahydroactinidiolide in the essential oil of cigar tobacco leaves was reported. Here we wish to describe the identification of P-A which remained unidentified in the previous paper as 2,3-dimethyl-4-hydroxy-2-nonenoic acid lactone. P-A, colorless liquid, had a celery like fragrant odor. Molecular ion at m/e 182.129 in the high resolution mass spectrometry of P-A established the molecular formula to be C11H18O2 (Calcd.: 182.130). Absorption bands at 1760cm-1 in the IR (Fig. 1) and at 216.5

Isolation from Cigar Tobacco Leaves of 2, 3-Dimethyl-4-hydroxy-2-nonenoic Acid Lactone