Aniline-d5 is a deuterated isotope marker of Aniline, which can be used for isotope tracing.Aniline induces toxicity to the spleen through iron overload and oxidative stress via heme oxygenase 1 up-regulation and is able to lead to a significant increase in p-IKKα and p-IKKβ, which in turn increases NF-κB and AP-1 binding activity.