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: Reduced nicotinamide adenine dinucleotide phosphate - diaphorase ( NADPH - d ) histochemistry was also employed to visualize NOS as an index of enzyme expression in mice brain regions related to motor control .
### Output Text:
Reduced <span class="chemical">nicotinamide adenine dinucleotide phosphate</span> - diaphorase ( <span class="chemical">NADPH</span> - d ) histochemistry was also employed to visualize NOS as an index of enzyme expression in mice brain regions related to motor control . 