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: Because ideal lipid targets were not reached ( low - density lipoprotein ( LDL ) cholesterol less than 130 mg / dl , high - density lipoprotein ( HDL ) cholesterol greater than 35 mg / dl , or total cholesterol / HDL cholesterol less than 4 . 5 mg / dl ) with diet plus a single drug , gemfibrozil ( 1 . 2 g / day ) - lovastatin ( primarily 20 or 40 mg ) treatment was given .
### Output Text:
Because ideal lipid targets were not reached ( low - density lipoprotein ( LDL ) <span class="chemical">cholesterol</span> less than 130 mg / dl , high - density lipoprotein ( HDL ) <span class="chemical">cholesterol</span> greater than 35 mg / dl , or total <span class="chemical">cholesterol</span> / HDL <span class="chemical">cholesterol</span> less than 4 . 5 mg / dl ) with diet plus a single drug , <span class="chemical">gemfibrozil</span> ( 1 . 2 g / day ) - <span class="chemical">lovastatin</span> ( primarily 20 or 40 mg ) treatment was given . 