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: We report the occurrence of severe hypertension ( blood pressure 190 / 160 ) in a 4 - year - old girl with neuroblastoma who was given Imipramine to control a behavior disorder .
### Output Text:
We report the occurrence of severe hypertension ( blood pressure 190 / 160 ) in a 4 - year - old girl with neuroblastoma who was given <span class="chemical">Imipramine</span> to control a behavior disorder . 