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 H01 Natural Sciences D010811 +
  H01.181 Chemistry D002621 +
    H01.181.122 Biochemistry D001671 +
    H01.181.216 Chemistry, Agricultural D002622 +
    H01.181.278 Chemistry, Analytical D002623 +
    H01.181.341 Chemistry, Clinical D002624 
    H01.181.404 Chemistry, Organic D002625 +
    H01.181.466 Chemistry, Pharmaceutical D002626 +
    H01.181.529 Chemistry, Physical D002627 +
    H01.181.650 Microchemistry D008832 
    H01.181.370 Chemistry, Inorganic D015392 +