Petrobactin is the primary siderophore synthesized by Bacillus anthracis str. Sterne under conditions of iron starvation.
Koppisch AT, Browder CC, Moe AL, Shelley JT, Kinkel BA, Hersman LE, Iyer S, Ruggiero CE. Petrobactin is the primary siderophore synthesized by Bacillus anthracis str. Sterne under conditions of iron starvation. Biometals. 2005 Dec; 18(6):577-85.