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: The effect of calcium chloride injected into the cerebral ventricles of group - housed unanaesthetized cats upon vocalization ( rage , hissing and snarling ) , fighting ( attack with paws and claws , defense with paws and claws and biting ) , mydriasis , tremor and clonic - tonic convulsions produced by carbachol and eserine injected similarly was investigated .
### Output Text:
The effect of <span class="chemical">calcium chloride</span> injected into the cerebral ventricles of group - housed unanaesthetized cats upon vocalization ( rage , hissing and snarling ) , fighting ( attack with paws and claws , defense with paws and claws and biting ) , mydriasis , tremor and clonic - tonic convulsions produced by <span class="chemical">carbachol</span> and <span class="chemical">eserine</span> injected similarly was investigated . 