4857
Toxicity of the synthetic polymeric 3 - alkylpyridinium salt ( APS3 ) is due to specific block of nicotinic acetylcholine receptors .
 Chemical: 3 - alkylpyridinium salt; Chemical: APS3; Chemical: acetylcholine
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: 3 - alkylpyridinium salt; Chemical: APS3; Chemical: acetylcholine