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: The homeostasis model assessment of insulin resistance also differed significantly among groups ( F ( 33 ) = 4 . 92 ; P = . 01 ) ( clozapine > olanzapine > risperidone ) ( clozapine vs risperidone , t ( 33 ) = 2 . 94 ; P = . 006 ; olanzapine vs risperidone , t ( 33 ) = 2 . 42 ; P = . 02 ) .
### Output Text:
The homeostasis model assessment of insulin resistance also differed significantly among groups ( F ( 33 ) = 4 . 92 ; P = . 01 ) ( <span class="chemical">clozapine</span> > <span class="chemical">olanzapine</span> > <span class="chemical">risperidone</span> ) ( <span class="chemical">clozapine</span> vs <span class="chemical">risperidone</span> , t ( 33 ) = 2 . 94 ; P = . 006 ; <span class="chemical">olanzapine</span> vs <span class="chemical">risperidone</span> , t ( 33 ) = 2 . 42 ; P = . 02 ) . 