A new oxo-sterol derivative from the rhizomes of <i>Costus speciosus</i>

<p>Chemical investigation of the rhizomes of <i>Costus speciosus</i> led to the isolation of a new compound, 22-ketocholesteryl palmitate (<b>1</b>) along with four known compounds, 24-methylenecycloartanol (<b>2</b>), cycloartanol (<b>3</b>), stigmasterol (<b>4</b>) and linoleic acid (<b>5</b>). The structure of new compound was characterised by extensive 1D-, 2D-NMR and mass spectrometry (GC-MS and HR-ESI-MS) techniques.</p>