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: It is apparent that calcium chloride can " dissociate " vocalization and fighting from autonomic and motor phenomena such as mydriasis , tremor and clonic - tonic convulsions caused by carbachol and eserine .
### Output Text:
It is apparent that <span class="chemical">calcium chloride</span> can " dissociate " vocalization and fighting from autonomic and motor phenomena such as mydriasis , tremor and clonic - tonic convulsions caused by <span class="chemical">carbachol</span> and <span class="chemical">eserine</span> . 