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: Adverse effects included a mildly dry mouth and a sore throat in 2 patients ( 2 % glycopyrrolate ) , a light headache in 1 patient ( 1 . 5 % glycopyrrolate ) .
### Output Text:
Adverse effects included a mildly dry mouth and a sore throat in 2 patients ( 2 % <span class="chemical">glycopyrrolate</span> ) , a light headache in 1 patient ( 1 . 5 % <span class="chemical">glycopyrrolate</span> ) . 