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: Administration of nocistatin ( 1 . 5 and / or 5 . 0 nmol mouse - 1 , i . c . v . ) 30 min before spontaneous alternation performance or the training session of the passive avoidance task , attenuated the scopolamine - induced impairment of spontaneous alternation and passive avoidance behaviours .
### Output Text:
Administration of <span class="chemical">nocistatin</span> ( 1 . 5 and / or 5 . 0 nmol mouse - 1 , i . c . v . ) 30 min before spontaneous alternation performance or the training session of the passive avoidance task , attenuated the <span class="chemical">scopolamine</span> - induced impairment of spontaneous alternation and passive avoidance behaviours . 