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: D - 1 agonist SKF 38393 or D - 2 agonist quinpirole decreased the catalepsy induced by fluphenazine , SCH 23390 or sulpiride .
### Output Text:
D - 1 agonist <span class="chemical">SKF 38393</span> or D - 2 agonist <span class="chemical">quinpirole</span> decreased the catalepsy induced by <span class="chemical">fluphenazine</span> , <span class="chemical">SCH 23390</span> or <span class="chemical">sulpiride</span> . 