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: Application of an irreversible inhibitor of GABA transaminase , gamma - vinyl - GABA ( D , L - 4 - amino - hex - 5 - enoic acid ) , 5 micrograms , into the SNR , bilaterally , suppressed the appearance of electrographic and behavioral seizures produced by pilocarpine , 380 mg / kg .
### Output Text:
Application of an irreversible inhibitor of <span class="chemical">GABA</span> transaminase , <span class="chemical">gamma - vinyl - GABA</span> ( <span class="chemical">D , L - 4 - amino - hex - 5 - enoic acid</span> ) , 5 micrograms , into the SNR , bilaterally , suppressed the appearance of electrographic and behavioral seizures produced by <span class="chemical">pilocarpine</span> , 380 mg / kg . 