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The lethal toxicity values (log 1/LD50) of 527 aliphatic and aromatic compounds in oral, intravenous, intramuscular and intraperitoneal routes were used to investigate the relationships of log 1/LD50 from different exposure routes. Regression analysis shows that the log 1/LD50 values are well correlated between intravenous and intraperitoneal or intramuscular injections. However, the correlations...