4318
A series of 3 , 4 , 5 - trimethoxycinnamic acid derivatives was prepared and evaluated for antinarcotic effects on morphine dependence in mice and binding affinities on serotonergic receptors .
 3 , 4 , 5 - trimethoxycinnamic acid, morphine
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 3 , 4 , 5 - trimethoxycinnamic acid, morphine