Measured plasma concentration-time profiles (mean ± SD) after intravenous (10 mg/kg; a, c, e, g) or oral (100 mg/kg) (b, d, f, h) administration of nitrofuranylamides to rats (n = 5–6 per group): Lee 562 (a and b), Lee 878 (c and d), Lee 952 (e and f), Lee 1106 (g and h)