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: It is recommended that either glycopyrrolate 10 micrograms kg - 1 or atropine 20 micrograms kg - 1 i . v . should immediately precede induction of anaesthesia , in children , if the repeated administration of suxamethonium is anticipated .
### Output Text:
It is recommended that either <span class="chemical">glycopyrrolate</span> 10 micrograms kg - 1 or <span class="chemical">atropine</span> 20 micrograms kg - 1 i . v . should immediately precede induction of anaesthesia , in children , if the repeated administration of <span class="chemical">suxamethonium</span> is anticipated . 