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 on a 92 - year - old woman with preexisting complete left bundle branch block who developed torsade de pointes after intravenous and oral administration of metoclopramide .
### Output Text:
We report on a 92 - year - old woman with preexisting complete left bundle branch block who developed torsade de pointes after intravenous and oral administration of <span class="chemical">metoclopramide</span> . 