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: Multivariate analysis revealed an odds ratio of 2 . 5 - fold for LAG to develop AKI compared with HAG ( 95 % confidence interval 1 . 195 to 5 . 124 , P = 0 . 039 ) .
### Output Text:
Multivariate analysis revealed an odds ratio of 2 . 5 - fold for LAG to develop AKI compared with HAG ( 95 % confidence interval 1 . 195 to 5 . 124 , P = 0 . 039 ) . 