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: Premedication of diazepam 10 mg and atropine 0 . 5 mg was given , and sleep was induced and maintained by intermittent intravenous injections of etomidate 0 . 1 / mg / kg , given whenever the patient would open his eyes on request .
### Output Text:
Premedication of <span class="chemical">diazepam</span> 10 mg and <span class="chemical">atropine</span> 0 . 5 mg was given , and sleep was induced and maintained by intermittent intravenous injections of <span class="chemical">etomidate</span> 0 . 1 / mg / kg , given whenever the patient would open his eyes on request . 