Isoflavones, a sesquiterpene lactone-monoterpene adduct and other constituents of Gaillardia species

Aerial parts of Gaillardia suavis gave orobol 7,3′-dimethyl ether and the new isoflavones 7,3′-dimethoxy-5,6,4′-trihydroxyisoflavone and 7-methoxy-5,6,4′-trihydroxyisoflavone. Gaillardia aestivalis from central Texas gave the 2′-acetylglucopyranosides of 12-hydroxynerolidol and 10,11-dihydro-12-hydroxynerolidol and the 2′,6′-diacetylglucopyranoside of 2-phenethyl alcohol as well as some common plant constituents, while the main constituent of several other G. aestivalis collections was a Diels—Alder adduct of multigilin and 8-hydroxy-α-phellandrene.