Fig. 4

HPLC–MS HapA1 and HapA2. UHPLC profiles of metabolic extracts from cultures of hapA1- and hapA2-expressing Aspergillus nidulans strains tStL07 and tStL08, the untransformed A. nidulans wild type strain, Hapalopilus rutilans mycelium as well as of polyporic acid standard. Analyzed peaks are indicated by numbered bars shaded in grey. Chromatograms were extracted at λ = 350 nm. Mass spectra were recorded in negative mode. Please refer to Additional file 2: Fig. S4 for UV/Vis spectra and Additional file 1: Table S3 and Additional file 2: Fig. S3 for MS/MS data. Compound numbering: phlebiopsin A (1); phlebiopsin B (2); polyporic acid (3)