7080
Mutant receptors were then alkylated with methanethiosulfonate - ethylammonium ( MTSEA ) , and binding inhibition was monitored using the CXCR4 antagonist FC131 [ cyclo ( - D - Tyr ( 1 ) - Arg ( 2 ) - Arg ( 3 ) - Nal ( 4 ) - Gly ( 5 ) - ) ] , which displays anti - HIV activity .
 Chemical: methanethiosulfonate - ethylammonium; Chemical: MTSEA; Chemical: FC131; Chemical: cyclo ( - D - Tyr ( 1 ) - Arg ( 2 ) - Arg ( 3 ) - Nal ( 4 ) - Gly ( 5 ) - )
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: methanethiosulfonate - ethylammonium; Chemical: MTSEA; Chemical: FC131; Chemical: cyclo ( - D - Tyr ( 1 ) - Arg ( 2 ) - Arg ( 3 ) - Nal ( 4 ) - Gly ( 5 ) - )