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: Over the total postinfusion period systolic and diastolic arterial pressure were 6 ( SEM 2 ) % and 7 ( 2 ) % , respectively , higher than after dextrose infusion ( ANOVA , p less than 0 . 001 ) .
### Output Text:
Over the total postinfusion period systolic and diastolic arterial pressure were 6 ( SEM 2 ) % and 7 ( 2 ) % , respectively , higher than after <span class="chemical">dextrose</span> infusion ( ANOVA , p less than 0 . 001 ) . 