Table 4. Acute Toxicity Test Result of 5-FU^a.

group	dose (mg/kg)/(mmol/kg)	Ni	Nd	R (%)	lg dose	probit (P + 5)
1	158.5/1.22	10	9	90	2.200	6.28
2	133.4/1.03	10	7	70	2.125	5.520
3	122.2/0.86	10	1	10	2.050	3.720

^aThe LD50 was 1.00 mmol/kg; 95% confidence interval is 0.38 ≤ LD50 ≤ 2.63 mmol/kg. R = N_d/N_i. N_i represents the initial animal number, while N_d represents the number of dead animals.