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: Toxicity in rhesus monkeys following administration of the 8 - aminoquinoline 8 - [ ( 4 - amino - l - methylbutyl ) amino ] - 5 - ( l - hexyloxy ) - 6 - methoxy - 4 - methylquinoline ( WR242511 ) .
### Output Text:
Toxicity in rhesus monkeys following administration of the <span class="chemical">8 - aminoquinoline</span> <span class="chemical">8 - [ ( 4 - amino - l - methylbutyl ) amino ] - 5 - ( l - hexyloxy ) - 6 - methoxy - 4 - methylquinoline</span> ( <span class="chemical">WR242511</span> ) . 