Structurally novel C₁₇-sesquiterpene lactones from <i>Ainsliaea pertyoides</i>

Abstract

Pertyolides A (<bold>1</bold>) and B (<bold>2</bold>), two unprecedented C₁₇-eudesmanolides with extended side chains, and one rare C₁₇-guaianolide, pertyolide C (<bold>3</bold>), along with 15 known sesquiterpene lactones were isolated from the whole plant of <italic>Ainsliaea pertyoides</italic>.