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: Case patients were more likely to be men ( odds ratio , 3 . 8 ; 95 % confidence interval , 1 . 2 - 12 . 1 ) , suffer from hay fever and asthma ( odds ratio , 3 . 4 ; 95 % confidence interval , 1 . 0 - 11 . 9 ) ; to participate in regular exercise ( odds ratio , 5 . 9 ; 95 % confidence interval , 1 . 1 - 30 . 7 ) , especially in the use of Nautilus equipment ( p = 0 . 02 ) ; and to use alcohol ( odds ratio , 4 . 4 ; 95 % confidence interval , 1 . 1 - 17 . 5 ) .
### Output Text:
Case patients were more likely to be men ( odds ratio , 3 . 8 ; 95 % confidence interval , 1 . 2 - 12 . 1 ) , suffer from hay fever and asthma ( odds ratio , 3 . 4 ; 95 % confidence interval , 1 . 0 - 11 . 9 ) ; to participate in regular exercise ( odds ratio , 5 . 9 ; 95 % confidence interval , 1 . 1 - 30 . 7 ) , especially in the use of Nautilus equipment ( p = 0 . 02 ) ; and to use <span class="chemical">alcohol</span> ( odds ratio , 4 . 4 ; 95 % confidence interval , 1 . 1 - 17 . 5 ) . 