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: Marital unhappiness , as indicated by AMHS scores , was not associated with arthritis but was associated with sexual dysfunction , sexual dissatisfaction and being female .
### Output Text:
Marital unhappiness , as indicated by AMHS scores , was not associated with arthritis but was associated with sexual dysfunction , sexual dissatisfaction and being female . 