HPLC analysis of the crude products isolated from fermentation cultures of S. atroolivaceus S-140 WT (I), SB3033 (i.e., ΔlnmE) (II), and SB3034 (i.e., ΔlnmE/lnmE) (III). The metabolites with similar UV absorption are 1 (●), 2 (♦), 3 (▼), 4 (◊), 5 (∇), and 6 (○).