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: Sequential measurement of QT interval during left ventricular angiography was made 30 seconds and one , three , five and ten minutes after injection of hypaque 76 .
### Output Text:
Sequential measurement of QT interval during left ventricular angiography was made 30 seconds and one , three , five and ten minutes after injection of <span class="chemical">hypaque 76</span> . 