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: RESULTS : Despite similar external diameters among CaCl ( 2 ) - treated , non - CaCl ( 2 ) - treated and NaCl - treated segments , aneurymal alteration ( n = 6 , 50 % ) , media degeneration with regional disruption , fragmentation of elastic fiber , and increased collagen deposition ( n = 12 , 100 % ) were demonstrated in CaCl ( 2 ) - treated segments .
### Output Text:
RESULTS : Despite similar external diameters among <span class="chemical">CaCl ( 2 )</span> - treated , non - <span class="chemical">CaCl ( 2 )</span> - treated and <span class="chemical">NaCl</span> - treated segments , aneurymal alteration ( n = 6 , 50 % ) , media degeneration with regional disruption , fragmentation of elastic fiber , and increased collagen deposition ( n = 12 , 100 % ) were demonstrated in <span class="chemical">CaCl ( 2 )</span> - treated segments . 