In the sentence extracted from biomedical literature, identify all the chemical entities. The required answer format is the same sentence with HTML <span> tags to mark up specific entities. 
### Entity Markup Guides:
Use <span class="chemical"> to denote a chemical.

### Input Text: Cervical and inguinal lymph node biopsies showed the features of severe necrotising lymphadenitis , associated with erythrophagocytosis and prominent eosinophilic infiltrates , without viral inclusion bodies , suggestive of an adverse drug reaction . A week later , fulminant drug - induced hepatitis , associated with the presence of anti - nuclear autoantibodies ( but not with other markers of autoimmunity ) , and accompanied by multi - organ failure and sepsis , supervened .
### Output Text:
Cervical and inguinal lymph node biopsies showed the features of severe necrotising lymphadenitis , associated with erythrophagocytosis and prominent eosinophilic infiltrates , without viral inclusion bodies , suggestive of an adverse drug reaction . A week later , fulminant drug - induced hepatitis , associated with the presence of anti - nuclear autoantibodies ( but not with other markers of autoimmunity ) , and accompanied by multi - organ failure and sepsis , supervened . 