Popis: |
Two novel pseudoguaianolide esters, arrivacins A ( 1 ) and B ( 2 ), have been isolated from the methylene chloride extract of Ambrosia psilostachya collected in Arrivaca Cienega, Arizona. The structures of the arrivacins, which are examples of sesquiterpene dimers formed from the condensation of two different pseudoguaianolide sesquiterpenes, were determined by analysis of the spectral data and chemical interconversion. Arrivacins A and B show potent binding to angiotensin II receptors in bovine adrenal membranes. |