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: A 43 - year - old woman had severe jaundice and itching 1 month after receiving methimazole ( 10 mg tid ) and propranolol ( 20 mg tid ) for treatment of hyperthyroidism .
### Output Text:
A 43 - year - old woman had severe jaundice and itching 1 month after receiving <span class="chemical">methimazole</span> ( 10 mg tid ) and <span class="chemical">propranolol</span> ( 20 mg tid ) for treatment of hyperthyroidism . 