Three new natural cyclopentenedione derivatives from Piper carniconnectivum

Abstract

Three new natural cyclopentenedione derivatives (1-3) and the known coumarin xanthyletin (4) were isolated from the roots of Piper carniconnectivum. The structures were established by spectroscopic data, mainly 1D and 2D NMR and EIMS.

Keywords

• Piper carniconnectivum
• Piperaceae
• cyclopentenedione derivatives
• xanthyletin