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Aim: Sulfur mustard (SM) can cause DNA damage and the activation of poly(ADPribose)polymerase (PARP).PARP inhibitor has been reported some protective effects in SM skin injury in vivo and in vitro.S003 is a PARP inhibitor synthesized by our institute.The aim of our study is to observe the effect of S003 in SM treated HaCaT cells and in SM induced mouse ear vesicant model (MEVM).