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: Catecholamine - induced cardiomyopathy due to chronic excess of endogenous catecholamines has been recognized for decades as a clinical phenomenon .
### Output Text:
<span class="chemical">Catecholamine</span> - induced cardiomyopathy due to chronic excess of endogenous <span class="chemical">catecholamines</span> has been recognized for decades as a clinical phenomenon . 