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: Apart from the reduction in the patient ' s level of consciousness , there were no signs of motor neurone damage or of any of the other known predisposing conditions for hyperkalaemia following the administration of suxamethonium .
### Output Text:
Apart from the reduction in the patient ' s level of consciousness , there were no signs of motor neurone damage or of any of the other known predisposing conditions for hyperkalaemia following the administration of <span class="chemical">suxamethonium</span> . 