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: Sulfonamides were associated with anencephaly ( adjusted OR [ AOR ] = 3 . 4 ; 95 % confidence interval [ CI ] , 1 . 3 - 8 . 8 ) , hypoplastic left heart syndrome ( AOR = 3 . 2 ; 95 % CI , 1 . 3 - 7 . 6 ) , coarctation of the aorta ( AOR = 2 . 7 ; 95 % CI , 1 . 3 - 5 . 6 ) , choanal atresia ( AOR = 8 . 0 ; 95 % CI , 2 . 7 - 23 . 5 ) , transverse limb deficiency ( AOR = 2 . 5 ; 95 % CI , 1 . 0 - 5 . 9 ) , and diaphragmatic hernia ( AOR = 2 . 4 ; 95 % CI , 1 . 1 - 5 . 4 ) .
### Output Text:
<span class="chemical">Sulfonamides</span> were associated with anencephaly ( adjusted OR [ AOR ] = 3 . 4 ; 95 % confidence interval [ CI ] , 1 . 3 - 8 . 8 ) , hypoplastic left heart syndrome ( AOR = 3 . 2 ; 95 % CI , 1 . 3 - 7 . 6 ) , coarctation of the aorta ( AOR = 2 . 7 ; 95 % CI , 1 . 3 - 5 . 6 ) , choanal atresia ( AOR = 8 . 0 ; 95 % CI , 2 . 7 - 23 . 5 ) , transverse limb deficiency ( AOR = 2 . 5 ; 95 % CI , 1 . 0 - 5 . 9 ) , and diaphragmatic hernia ( AOR = 2 . 4 ; 95 % CI , 1 . 1 - 5 . 4 ) . 