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: Assessments of marital happiness and depressed mood were also made using the CES - D and the Azrin Marital Happiness Scale ( AMHS ) .
### Output Text:
Assessments of marital happiness and depressed mood were also made using the CES - D and the Azrin Marital Happiness Scale ( AMHS ) . 