17253
The objective of this study was to compare the PK of doxylamine / pyridoxine delayed - released combination in pregnant versus nonpregnant women .
 Chemical: doxylamine; Chemical: pyridoxine
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: doxylamine; Chemical: pyridoxine