HPLC analysis of fermentation broths from Streptomyces sp. strains UC 11065(dox8::pDox8hx), UC 11065(dox17::pDox17hx), and wild-type UC 11065 (WT) using HPLC conditions described in Materials and Methods. B, pyrrolomycin B; C, pyrrolomycin C; DIOX, dioxapyrrolomycin; X, unknown metabolite.