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 protective effect was prevalent among D - glucarates , and also to other saccharic acid , hexauronic acids and hexaaldonic acids , although to a lesser degree , but not to a hexaaldose , sugar alcohols , substances inthe TCA cycle and other acidic compounds .
### Output Text:
The protective effect was prevalent among <span class="chemical">D - glucarates</span> , and also to other <span class="chemical">saccharic acid</span> , <span class="chemical">hexauronic acids</span> and <span class="chemical">hexaaldonic acids</span> , although to a lesser degree , but not to a hexaaldose , <span class="chemical">sugar alcohols</span> , substances inthe <span class="chemical">TCA</span> cycle and other acidic compounds . 