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: Crocin reduced inhibition of ERK activation and diazinon - induced hyperlipemia and increased levels of LDLr transcript .
### Output Text:
<span class="chemical">Crocin</span> reduced inhibition of ERK activation and <span class="chemical">diazinon</span> - induced hyperlipemia and increased levels of LDLr transcript . 