STRUCTURES OF A NEW-TYPE OF YELLOW PIGMENTS, FALCONENSONE-A AND FALCONENSONE-B, FROM EMERICELLA FALCONENSIS

Two new yellow pigments designated falconensones A 1 and B 2 have been isolated from the mycelium of Emericella falconensis and/or E. frutic ulosa along with new azaphilone derivatives, falconensins A-H, and hop ane-type triterpenes, zeorin, hopane-7 beta,22-diol, and hopane-6 alph a,7 beta,22-triol. The structures of 1 and 2 have been determined by s pectroscopic investigations and an X-ray analysis of the p-bromophenyl -hydrazone of 1 acetone solvate, Compounds 1 and 2 have a novel carbon skeleton: namely, they are cyclopent-2-enone derivatives connected to an extensively conjugated methyl ketone at C-3.