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: Moreover , KF17837 ( 0 . 625 mg / kg p . o . ) potentiated the anticataleptic effects of a subthreshold dose of L - 3 , 4 - dihydroxyphenylalanine ( L - DOPA ; 25 mg / kg i . p . ) plus benserazide ( 6 . 25 mg / kg i . p . ) .
### Output Text:
Moreover , <span class="chemical">KF17837</span> ( 0 . 625 mg / kg p . o . ) potentiated the anticataleptic effects of a subthreshold dose of <span class="chemical">L - 3 , 4 - dihydroxyphenylalanine</span> ( <span class="chemical">L - DOPA</span> ; 25 mg / kg i . p . ) plus <span class="chemical">benserazide</span> ( 6 . 25 mg / kg i . p . ) . 