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 : 32 patients were evaluable for response - complete remission 9 . 1 % ( n = 3 ) , partial remission 45 . 5 % ( n = 15 ) , no change 27 . 3 % ( n = 9 ) , progressive disease 15 . 1 % ( n = 5 ) .
### Output Text:
RESULTS : 32 patients were evaluable for response - complete remission 9 . 1 % ( n = 3 ) , partial remission 45 . 5 % ( n = 15 ) , no change 27 . 3 % ( n = 9 ) , progressive disease 15 . 1 % ( n = 5 ) . 