19231
Pyranose ring flexing ( puckering ) in 2 - O - sulfo - alpha - l - iduronic acid , which underlies heparin - mediated anticoagulation , was modulated by polymerization ( chain position and adjacent residues ) , which is supported by previous experiments .
 Chemical: Pyranose; Chemical: 2 - O - sulfo - alpha - l - iduronic acid
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: Pyranose; Chemical: 2 - O - sulfo - alpha - l - iduronic acid