6847
New targeted therapies include 5 - HT ( 1F ) receptor agonists , calcitonin gene - related peptide ( CGRP ) antagonists , nitric oxide synthetase inhibitors , and ion channel antagonists .
 Chemical: 5 - HT; Chemical: nitric oxide
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: 5 - HT; Chemical: nitric oxide