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: Similarly , benzene - derived catechol and hydroquinone , but not phenol , induce apoptosis in HBMP cells [ Moran et al . , Mol . Pharmacol . , 50 ( 1996 ) 610 - 615 ] .
### Output Text:
Similarly , <span class="chemical">benzene</span> - derived <span class="chemical">catechol</span> and <span class="chemical">hydroquinone</span> , but not <span class="chemical">phenol</span> , induce apoptosis in HBMP cells [ Moran et al . , Mol . Pharmacol . , 50 ( 1996 ) 610 - 615 ] . 