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: More than 50 % of Lobund - Wistar ( L - W ) strain rats developed large , palpable prostate adenocarcinomas ( PAs ) following treatments with N - nitroso - N - methylurea ( CAS : 684 - 93 - 5 ) and testosterone propionate [ ( TP ) CAS : 57 - 85 - 2 ] , and most of the tumor - bearing rats manifested metastatic lesions .
### Output Text:
More than 50 % of Lobund - Wistar ( L - W ) strain rats developed large , palpable prostate adenocarcinomas ( PAs ) following treatments with <span class="chemical">N - nitroso - N - methylurea</span> ( CAS : 684 - 93 - 5 ) and <span class="chemical">testosterone propionate</span> [ ( <span class="chemical">TP</span> ) CAS : 57 - 85 - 2 ] , and most of the tumor - bearing rats manifested metastatic lesions . 