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: During follow - up ( median 5 years ) , there were no significant differences in rejection ( acute and chronic ) , graft failure or survival between the groups ( acetaminophen - induced ALF 1 year 87 % , 5 years 75 % ; non - acetaminophen - induced ALF 88 % , 78 % ; CLD 93 % , 82 % : P > 0 . 6 log rank ) .
### Output Text:
During follow - up ( median 5 years ) , there were no significant differences in rejection ( acute and chronic ) , graft failure or survival between the groups ( <span class="chemical">acetaminophen</span> - induced ALF 1 year 87 % , 5 years 75 % ; non - <span class="chemical">acetaminophen</span> - induced ALF 88 % , 78 % ; CLD 93 % , 82 % : P > 0 . 6 log rank ) . 