23778
The mean +/- SEM epidermal layer count for SDS was 3 . 60 +/- 0 . 25 , atrazine was 3 . 40 +/- 0 . 25 , petrol was 3 . 40 +/- 0 . 25 , and ethanol ( control ) was 1 . 00 +/- 0 . 20 .
 Chemical: SDS; Chemical: atrazine; Chemical: ethanol
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: SDS; Chemical: atrazine; Chemical: ethanol