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: RESULTS : A total of 1346 patients were randomized into the 8 - week core study ( 734 men , 612 women ; 924 white , 291 black , 23 Asian , 108 other ; mean age , 52 . 7 years ; mean weight , 92 . 6 kg ) .
### Output Text:
RESULTS : A total of 1346 patients were randomized into the 8 - week core study ( 734 men , 612 women ; 924 white , 291 black , 23 Asian , 108 other ; mean age , 52 . 7 years ; mean weight , 92 . 6 kg ) . 