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: It is suggested that the patient had sulfasalazine - induced lupus , which manifested with serositis and pulmonary parenchymal involvement in the absence of joint symptoms .
### Output Text:
It is suggested that the patient had <span class="chemical">sulfasalazine</span> - induced lupus , which manifested with serositis and pulmonary parenchymal involvement in the absence of joint symptoms . 