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: Moreover , 0 . 05 mg / kg of this beta - carboline reduced markedly the increase of [ 35S ] TBPS binding and the convulsions induced by isoniazid ( 200 mg / kg s . c . ) . ( ABSTRACT TRUNCATED AT 250 WORDS )
### Output Text:
Moreover , 0 . 05 mg / kg of this <span class="chemical">beta - carboline</span> reduced markedly the increase of <span class="chemical">[ 35S ] TBPS</span> binding and the convulsions induced by <span class="chemical">isoniazid</span> ( 200 mg / kg s . c . ) . ( ABSTRACT TRUNCATED AT 250 WORDS ) 