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: The oxytocin should be given only in Ringers lactate or , alternately , in Ringers lactate and a 5 per cent dextrose and water solutions .
### Output Text:
The <span class="chemical">oxytocin</span> should be given only in Ringers <span class="chemical">lactate</span> or , alternately , in Ringers <span class="chemical">lactate</span> and a 5 per cent <span class="chemical">dextrose</span> and water solutions . 