21502
Amongst the common volatile organic compounds ( VOCs ) identified between levoglucosan , abietic acid , and nitroguaiacol were methanol , acetaldehyde , formic acid , and acetic acid .
 Chemical: levoglucosan; Chemical: abietic acid; Chemical: nitroguaiacol; Chemical: methanol; Chemical: acetaldehyde; Chemical: formic acid; Chemical: acetic acid
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: levoglucosan; Chemical: abietic acid; Chemical: nitroguaiacol; Chemical: methanol; Chemical: acetaldehyde; Chemical: formic acid; Chemical: acetic acid