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: Added in vitro to rat cortical membrane preparation , abecarnil increased [ 3H ] GABA binding , enhanced muscimol - stimulated 36Cl - uptake and reduced the binding of t - [ 35S ] butylbicyclophosphorothionate ( [ 35S ] TBPS ) .
### Output Text:
Added in vitro to rat cortical membrane preparation , <span class="chemical">abecarnil</span> increased [ 3H ] <span class="chemical">GABA</span> binding , enhanced <span class="chemical">muscimol</span> - stimulated 36Cl - uptake and reduced the binding of <span class="chemical">t - [ 35S ] butylbicyclophosphorothionate</span> ( <span class="chemical">[ 35S ] TBPS</span> ) . 