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: METHODS : Ninety patients classified as American Society of Anesthesiologists physical status I or II who were scheduled for short gynecologic procedures under spinal anesthesia were randomly allocated to receive 2 . 5 ml 2 % lidocaine in 7 . 5 % glucose , 2 % prilocaine in 7 . 5 % glucose , or 0 . 5 % bupivacaine in 7 . 5 % glucose .
### Output Text:
METHODS : Ninety patients classified as American Society of Anesthesiologists physical status I or II who were scheduled for short gynecologic procedures under spinal anesthesia were randomly allocated to receive 2 . 5 ml 2 % <span class="chemical">lidocaine</span> in 7 . 5 % <span class="chemical">glucose</span> , 2 % <span class="chemical">prilocaine</span> in 7 . 5 % <span class="chemical">glucose</span> , or 0 . 5 % <span class="chemical">bupivacaine</span> in 7 . 5 % <span class="chemical">glucose</span> . 