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: Glyceryl trinitrate infusion completely normalized the prostigmine - morphine - induced alterations in these quantitative parameters ( TmaX over the LP : 11 . 33 + / - 1 . 13 ; over the HH : 18 . 88 + / - 1 . 48 ; and over the CBD : 36 . 22 + / - 1 . 92 ; and T1 / 2 over the LP : 28 . 21 + / - 1 . 83 ; over the HH : 33 . 42 + / - 3 . 10 ; and over the CBD : 41 . 66 + / - 6 . 33 ) , suggesting an effective sphincter - relaxing effect of glyceryl trinitrate .
### Output Text:
<span class="chemical">Glyceryl trinitrate</span> infusion completely normalized the <span class="chemical">prostigmine</span> - <span class="chemical">morphine</span> - induced alterations in these quantitative parameters ( TmaX over the LP : 11 . 33 + / - 1 . 13 ; over the HH : 18 . 88 + / - 1 . 48 ; and over the CBD : 36 . 22 + / - 1 . 92 ; and T1 / 2 over the LP : 28 . 21 + / - 1 . 83 ; over the HH : 33 . 42 + / - 3 . 10 ; and over the CBD : 41 . 66 + / - 6 . 33 ) , suggesting an effective sphincter - relaxing effect of <span class="chemical">glyceryl trinitrate</span> . 