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: Long - term administration of quinidine was associated with persistent elevation of serum concentrations of SGOT , lactic acid dehydrogenase , and alkaline phosphatase .
### Output Text:
Long - term administration of <span class="chemical">quinidine</span> was associated with persistent elevation of serum concentrations of SGOT , <span class="chemical">lactic acid</span> dehydrogenase , and alkaline phosphatase . 