14927
Formulation , in vitro evaluation and study of variables on tri - layered gastro - retentive delivery system of diltiazem HCl .
 Chemical: diltiazem HCl
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: diltiazem HCl