1454
However , in rats lever pressing for food rewards under a variable interval 30s schedule of instrumental responding , the drug clearly attenuated not only the suppression of response rate induced by SDZ 220 , 581 but also the stimulation of response rate induced by Ro 63 - 1908 .
 Chemical: SDZ 220 , 581; Chemical: Ro 63 - 1908
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: SDZ 220 , 581; Chemical: Ro 63 - 1908