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: METHODS : The combination of carboplatin ( area under the concentration curve [ AUC ] , 5 ) and liposomal doxorubicin ( Doxil ; starting dose , 40 mg / m ( 2 ) ) was administered intravenously every 28 days to 37 patients with recurrent squamous cell cervical carcinoma to determine antitumor activity and toxicity profile .
### Output Text:
METHODS : The combination of <span class="chemical">carboplatin</span> ( area under the concentration curve [ AUC ] , 5 ) and liposomal <span class="chemical">doxorubicin</span> ( <span class="chemical">Doxil</span> ; starting dose , 40 mg / m ( 2 ) ) was administered intravenously every 28 days to 37 patients with recurrent squamous cell cervical carcinoma to determine antitumor activity and toxicity profile . 