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: Two mouse lines were selectively bred according to their sensitivity ( BS line ) or resistance ( BR line ) to seizures induced by a single i . p . injection of methyl beta - carboline - 3 - carboxylate ( beta - CCM ) , an inverse agonist of the GABA ( A ) receptor benzodiazepine site .
### Output Text:
Two mouse lines were selectively bred according to their sensitivity ( BS line ) or resistance ( BR line ) to seizures induced by a single i . p . injection of <span class="chemical">methyl beta - carboline - 3 - carboxylate</span> ( <span class="chemical">beta - CCM</span> ) , an inverse agonist of the <span class="chemical">GABA</span> ( A ) receptor <span class="chemical">benzodiazepine</span> site . 