7491
The delta ( 13 ) C /1000 values of the endogenous E1 , E2 , and E3 were - 21 . 62 +/- 1 . 07 , - 22 . 14 +/- 0 . 98 , and - 21 . 88 +/- 1 . 16 , with P < 0 . 01 ( t - test ) .
 Chemical: ( 13 ) C
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: ( 13 ) C