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 encouraging results obtained in various authoratative departments in myopathic patients by using anabolizing steroids have encouraged the authors to investigate the beneficial effects of one anabolizing agent ( Dianabol , CIBA ) at high doses in rats rendered myopathic by a diet deficient in vitamin E .
### Output Text:
The encouraging results obtained in various authoratative departments in myopathic patients by using anabolizing <span class="chemical">steroids</span> have encouraged the authors to investigate the beneficial effects of one anabolizing agent ( <span class="chemical">Dianabol</span> , <span class="chemical">CIBA</span> ) at high doses in rats rendered myopathic by a diet deficient in <span class="chemical">vitamin E</span> . 