4372
A method is described for the simultaneous determination of 1 , alpha - acetylmethadol ( LAAM ) and five active metabolites - - noracetylmethadol , dinoracetylmethadol , methadol , normethadol , and dinormethadol - - in biofluids by high - performance liquid chromatography using a normal - phase column and a UV detector at 218 nm .
 None
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
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