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: An activated moiety , i . e . N - acylimidazole derivative of etodolac ( EAI ) , was condensed with the polysaccharide polymer dextran of different molecular weights ( 40000 , 60000 , 110000 and 200000 ) .
### Output Text:
An activated moiety , i . e . <span class="chemical">N - acylimidazole</span> derivative of <span class="chemical">etodolac</span> ( <span class="chemical">EAI</span> ) , was condensed with the polysaccharide polymer <span class="chemical">dextran</span> of different molecular weights ( 40000 , 60000 , 110000 and 200000 ) . 