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: These short - term studies showed that enalapril reduced arterial blood pressure ( 101 + / - 2 vs . 124 + / - 3 mm Hg , group 2 vs . 1 , P less than 0 . 05 ) and glomerular capillary pressure ( 54 + / - 1 vs . 61 + / - 2 mm Hg , P less than 0 . 05 ) without reducing albuminuria ( 617 + / - 50 vs . 570 + / - 47 mg / day ) or GFR ( 1 . 03 + / - 0 . 04 vs . 1 . 04 + / - 0 . 11 ml / min ) .
### Output Text:
These short - term studies showed that <span class="chemical">enalapril</span> reduced arterial blood pressure ( 101 + / - 2 vs . 124 + / - 3 mm Hg , group 2 vs . 1 , P less than 0 . 05 ) and glomerular capillary pressure ( 54 + / - 1 vs . 61 + / - 2 mm Hg , P less than 0 . 05 ) without reducing albuminuria ( 617 + / - 50 vs . 570 + / - 47 mg / day ) or GFR ( 1 . 03 + / - 0 . 04 vs . 1 . 04 + / - 0 . 11 ml / min ) . 