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: Indications for transplantation were idiopathic cardiomyopathy ( 52 % ) , congenital heart disease ( 35 % ) with and without prior repair ( 71 % and 29 % , respectively ) , hypertrophic cardiomyopathy ( 5 % ) , valvular heart disease ( 3 % ) , and doxorubicin cardiomyopathy ( 5 % ) .
### Output Text:
Indications for transplantation were idiopathic cardiomyopathy ( 52 % ) , congenital heart disease ( 35 % ) with and without prior repair ( 71 % and 29 % , respectively ) , hypertrophic cardiomyopathy ( 5 % ) , valvular heart disease ( 3 % ) , and <span class="chemical">doxorubicin</span> cardiomyopathy ( 5 % ) . 