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: Adriamycin ( 50 mg / 50 ml ) was administered intravesically within 24 h after transurethral resection of TA - T1 ( O - A ) bladder tumors .
### Output Text:
<span class="chemical">Adriamycin</span> ( 50 mg / 50 ml ) was administered intravesically within 24 h after transurethral resection of TA - T1 ( O - A ) bladder tumors . 