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: Admission laboratory tests were as follows : alanine aminotransferase , 67 U / L ( reference range , 10 - 37 U / L ) ; aspartate aminotransferase , 98 U / L ( 10 - 40 U / L ) ; alkaline phosphatase , 513 U / L ( 0 - 270 U / L ) ; gamma - glutamyltransferase , 32 U / L ( 7 - 49 U / L ) ; amylase , 46 U / L ( 0 - 220 U / L ) ; total bilirubin , 20 . 1 mg / dL ( 0 . 2 - 1 . 0 mg / dL ) ; direct bilirubin , 14 . 8 mg / dL ( 0 - 0 . 3 mg / dL ) ; and albumin , 4 . 7 mg / dL ( 3 . 5 - 5 . 4 mg / dL ) .
### Output Text:
Admission laboratory tests were as follows : <span class="chemical">alanine</span> aminotransferase , 67 U / L ( reference range , 10 - 37 U / L ) ; <span class="chemical">aspartate</span> aminotransferase , 98 U / L ( 10 - 40 U / L ) ; alkaline phosphatase , 513 U / L ( 0 - 270 U / L ) ; gamma - glutamyltransferase , 32 U / L ( 7 - 49 U / L ) ; amylase , 46 U / L ( 0 - 220 U / L ) ; total <span class="chemical">bilirubin</span> , 20 . 1 mg / dL ( 0 . 2 - 1 . 0 mg / dL ) ; direct <span class="chemical">bilirubin</span> , 14 . 8 mg / dL ( 0 - 0 . 3 mg / dL ) ; and albumin , 4 . 7 mg / dL ( 3 . 5 - 5 . 4 mg / dL ) . 