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In gas chromatography, however, we see no additional peak dispersion when the post-column connecting tubing is equal to or less than the diameter of the

The structure assigned to botryodiplodin is based mainly on physical methods including chemical ionization mass spectrometry used for the first time as a tool in organic structure elucidation. SOME physical, chemical, and biological properties of the compound botryodiplodin were reported by Sen Gupta, Chandran, and Divekar who isolated this antibiotic from Botryodiplodia theobromae Pat.2 We assign structure (I) to botryodiplodin based on physical and chemical evidence.The i.r. spectrum of botryodiplodin showed ketone carbonyl absorption at 17 13 cm. -l and hydroxyl absorption a t 3400 cm.-l. Acetylation of botryodiplodin with acetic anhydride and anhydrous pyridine afforded a product (11) with no hydroxyl absorption in its i.r. spectrum but with an added carbonyl absorption band at 1735 cm.-l, indicating the presence of a saturated ester. Hydrolysis of botryodiplodin acetate ( 11) with water at room temperature regenerated botryodiplodin .

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