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: Similarly , EPS - related adverse events with QTP + Li / DVP ( 21 . 4 % ) were no different than with PBO + Li / DVP ( 19 . 2 % ) .
### Output Text:
Similarly , EPS - related adverse events with <span class="chemical">QTP</span> + <span class="chemical">Li</span> / <span class="chemical">DVP</span> ( 21 . 4 % ) were no different than with PBO + <span class="chemical">Li</span> / <span class="chemical">DVP</span> ( 19 . 2 % ) . 