5452
Among the different factors hypothesized to be responsible for the virtual disappearance of Egeria densa , once a dominant aquatic macrophyte in a southern Chile wetland ecosystem , are the negative effects of certain chemical compounds ( mainly chlorate ) and harsh environmental conditions ( desiccation caused by prolonged atmospheric exposure ) .
 Chemical: chlorate
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: chlorate