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: The pharmacokinetics parameters were : Ke , ( 0 . 15 + / - 0 . 03 / h in OD vs . 0 . 24 + / - 0 . 06 / h in TD ) , t1 / 2 , ( 4 . 95 + / - 1 . 41 h in OD vs . 3 . 07 + / - 0 . 71 h in TD ) , Vd ( 0 . 35 + / - 0 . 11 l / kg in OD vs . 0 . 33 + / - 0 . 09 l / kg in TD ) , Cl ( 0 . 86 + / - 0 . 29 ml / min / kg in OD vs . 1 . 28 + / - 0 . 33 ml / min / kg in TD ) .
### Output Text:
The pharmacokinetics parameters were : Ke , ( 0 . 15 + / - 0 . 03 / h in OD vs . 0 . 24 + / - 0 . 06 / h in TD ) , t1 / 2 , ( 4 . 95 + / - 1 . 41 h in OD vs . 3 . 07 + / - 0 . 71 h in TD ) , Vd ( 0 . 35 + / - 0 . 11 l / kg in OD vs . 0 . 33 + / - 0 . 09 l / kg in TD ) , Cl ( 0 . 86 + / - 0 . 29 ml / min / kg in OD vs . 1 . 28 + / - 0 . 33 ml / min / kg in TD ) . 