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: Administration of THP ( 3 . 75 , 7 . 5 and 15 mg / kg i . p . ) 1 h prior to haloperidol resulted in a dose - dependent increase in the catalepsy times ( P < 0 . 05 ) .
### Output Text:
Administration of <span class="chemical">THP</span> ( 3 . 75 , 7 . 5 and 15 mg / kg i . p . ) 1 h prior to <span class="chemical">haloperidol</span> resulted in a dose - dependent increase in the catalepsy times ( P < 0 . 05 ) . 