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: VCM was administrated intraperitoneally ( i . p . ) with 200mgkg ( - 1 ) twice daily for 7 days .
### Output Text:
<span class="chemical">VCM</span> was administrated intraperitoneally ( i . p . ) with 200mgkg ( - 1 ) twice daily for 7 days . 