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: Bond and Lader ' s visual analog scales and alternate versions of the Buschke Selective Reminding Test were administered in a repeated measures design at baseline , 1 , 2 . 5 , and 5 hours postdrug administration .
### Output Text:
Bond and Lader ' s visual analog scales and alternate versions of the Buschke Selective Reminding Test were administered in a repeated measures design at baseline , 1 , 2 . 5 , and 5 hours postdrug administration . 