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: A > 15 . 9 % decrease in GLS [ sensitivity , 86 % ; specificity , 75 % ; area under the curve ( AUC ) = 0 . 815 ; P = 0 . 001 ] and a > 0 . 004 ng / mL elevation in cTnT ( sensitivity , 79 % ; specificity , 64 % ; AUC = 0 . 757 ; P = 0 . 005 ) from baseline to the third cycle of chemotherapy predicted later cardiotoxicity .
### Output Text:
A > 15 . 9 % decrease in GLS [ sensitivity , 86 % ; specificity , 75 % ; area under the curve ( AUC ) = 0 . 815 ; P = 0 . 001 ] and a > 0 . 004 ng / mL elevation in cTnT ( sensitivity , 79 % ; specificity , 64 % ; AUC = 0 . 757 ; P = 0 . 005 ) from baseline to the third cycle of chemotherapy predicted later cardiotoxicity . 