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: However , when a second dose of the steroid was administered 1 hr after the first dose , complete protection from the kainic acid - induced limbic seizures and status epilepticus was obtained .
### Output Text:
However , when a second dose of the <span class="chemical">steroid</span> was administered 1 hr after the first dose , complete protection from the <span class="chemical">kainic acid</span> - induced limbic seizures and status epilepticus was obtained . 