ABSTRACT
Systematic numbering shown. These compds. are often numbered as cyclised prenylxanthones with the numbering going round the xanthone nucleus only. Bright yellow prisms (MeOH). Mp 2122148 Mp 256-2578 dec. lmax 240 (e 12200); 279 (e 40800); 334 (e 18200) (MeOH) (Berdy). lmax 241 (e 18200); 283 (e 41700); 332 (e 19050) (EtOH) (Berdy). 5-Me ether: [189065-54-1] Caloxanthone
K. 1-O-Methyljacareubin C19H16O6 340.332 Amorph. yellow powder. lmax 257 (sh); 268; 300 (sh); 350 (sh) (No solvent reported).
