Bayin was isolated, its structure was inferred from NMR and UV spectra as 7,4'-dihydroxyflavone-8-C-glycoside, confirmed by comparison with authentic bayin hexaacetate, representing the second isolation from a natural source. Pseudobaptigenin, Cladrastin-7-O-β-D-glucoside, and Cladrastin were characterized by spectral data (NMR, UV, MS). We have previously described the characterization of 5 biogenetically related dioxopiperazines from maize meal infected with Aspergillus ustus; the structure and absolute configuration of 12S-tetrahydroaustamide was confirmed by X-ray crystallography. In the present investigation, toxic material from A. ustus-infected maize meal was separated, yielding prolyl-2-(1',1'-dimethylallyl) tryptophyldioxopiperazine, austamide, and a new minor metabolite assigned as 2S,9S,12R-12,13-dihydro-12-hydroxyaustamide via comparison with known austamides' spectral data. From taxonomic interest, we examined Clausena heptaphylla (Rutaceae), from which we previously isolated two new carbazole alkaloids (heptazoline, heptazolidine) plus murrayanine and dentatin; we now report isolating another carbazole alkaloid identified as murrayacine.