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: Because of the relatively short final half - life of monoHER ( about 30 min ) , it is expected that the time interval between monoHER and DOX might be of influence on the cardioprotective effect of monoHER .
### Output Text:
Because of the relatively short final half - life of <span class="chemical">monoHER</span> ( about 30 min ) , it is expected that the time interval between <span class="chemical">monoHER</span> and <span class="chemical">DOX</span> might be of influence on the cardioprotective effect of <span class="chemical">monoHER</span> . 