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: The development of severe anemia at 6 months post - CAB was predictable by the reduction of Hb baseline value of more than 2 . 5 g / dl after 3 months of CAB ( p = 0 . 01 ) .
### Output Text:
The development of severe anemia at 6 months post - CAB was predictable by the reduction of Hb baseline value of more than 2 . 5 g / dl after 3 months of CAB ( p = 0 . 01 ) . 