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The effects of intracoronary administration of methylergonovine were studied in 21 patients with variant angina and 22 patients with atypical chest pain and in others without angina pectoris ( control group ) .
 methylergonovine, variant angina, chest pain, angina pectoris
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 methylergonovine, variant angina, chest pain, angina pectoris