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: At doses where alone , they produced no significant effects on locomotion , BD1018 , BD1063 and LR132 significantly attenuated the locomotor stimulatory effects of cocaine .
### Output Text:
At doses where alone , they produced no significant effects on locomotion , <span class="chemical">BD1018</span> , <span class="chemical">BD1063</span> and <span class="chemical">LR132</span> significantly attenuated the locomotor stimulatory effects of <span class="chemical">cocaine</span> . 