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: Extrapyramidal symptom severity scores were 1 . 4 ( 95 % CI = 1 . 2 - 1 . 6 ) with risperidone and 1 . 2 ( 95 % CI = 1 . 0 - 1 . 4 ) with olanzapine .
### Output Text:
Extrapyramidal symptom severity scores were 1 . 4 ( 95 % CI = 1 . 2 - 1 . 6 ) with <span class="chemical">risperidone</span> and 1 . 2 ( 95 % CI = 1 . 0 - 1 . 4 ) with <span class="chemical">olanzapine</span> . 