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: All patients had some response to the combined therapy and five of the seven went into complete remission after one or two courses of AraG / VP / CPM .
### Output Text:
All patients had some response to the combined therapy and five of the seven went into complete remission after one or two courses of <span class="chemical">AraG</span> / <span class="chemical">VP</span> / <span class="chemical">CPM</span> . 