18800
Blood samples were drawn 4 h after the intake of an oral dose of omeprazole 40 mg , and plasma levels of omeprazole and its metabolites were analyzed by high - performance liquid chromatography ( HPLC ) using a chiral column .
 Chemical: omeprazole; Chemical: omeprazole
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: omeprazole, omeprazole 
Answer:
 Chemical: omeprazole; Chemical: omeprazole