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: Subgroups presumed to be at higher risk for ACE inhibitor intolerance ( blood pressure , < 120 mm Hg ; creatinine , > or = 132 . 6 micromol / L [ > or = 1 . 5 mg / dL ] ; age , > or = 70 years ; and patients with diabetes ) generally tolerated the high - dose strategy .
### Output Text:
Subgroups presumed to be at higher risk for <span class="chemical">ACE inhibitor</span> intolerance ( blood pressure , < 120 mm Hg ; <span class="chemical">creatinine</span> , > or = 132 . 6 micromol / L [ > or = 1 . 5 mg / dL ] ; age , > or = 70 years ; and patients with diabetes ) generally tolerated the high - dose strategy . 