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 appearance of impaired cardiac adrenergic neuron activity in the presence of slight myocardial impairment ( scattered or focal vacuolar degeneration ) indicates that MIBG scintigraphy may be a useful method for detection of adriamycin - induced cardiomyopathy .
### Output Text:
The appearance of impaired cardiac adrenergic neuron activity in the presence of slight myocardial impairment ( scattered or focal vacuolar degeneration ) indicates that <span class="chemical">MIBG</span> scintigraphy may be a useful method for detection of <span class="chemical">adriamycin</span> - induced cardiomyopathy . 