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: Daily administration of desipramine , an inhibitor of the NET , for 5 days decreased [ ( 3 ) H ] norepinephrine uptake in the P2 fractions of hippocampus but not cortex , striatum or amygdalae .
### Output Text:
Daily administration of <span class="chemical">desipramine</span> , an inhibitor of the NET , for 5 days decreased [ ( 3 ) H ] <span class="chemical">norepinephrine</span> uptake in the P2 fractions of hippocampus but not cortex , striatum or amygdalae . 