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: Two multigravida patients with no prior psychiatric history were seen with postpartum psychosis , having received bromocriptine for inhibition of lactation .
### Output Text:
Two multigravida patients with no prior psychiatric history were seen with postpartum psychosis , having received <span class="chemical">bromocriptine</span> for inhibition of lactation . 