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: A 59 - year - old woman with ulcerative colitis developed red eyes , pleural effusion , eosinophilia and urinary abnormalities after restarting of sulphasalazine treatment .
### Output Text:
A 59 - year - old woman with ulcerative colitis developed red eyes , pleural effusion , eosinophilia and urinary abnormalities after restarting of <span class="chemical">sulphasalazine</span> treatment . 