16374
Technical - grade P2NA was contaminated with carcinogenic 2 - naphthylamine ( 2NA ) , and bladder cancer risk in exposed workers was attributed to this impurity .
 Chemical: P2NA; Chemical: 2 - naphthylamine; Chemical: 2NA
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: P2NA; Chemical: 2 - naphthylamine; Chemical: 2NA