All

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 D02 Organic Chemicals D009930 +
  D02.948 Urea D014508 +
    D02.948.117 Biureas D001736 
    D02.948.130 Biuret D001737 
    D02.948.160 Bromisovalum D001968 
    D02.948.395 Hydroxyurea D006918 
    D02.948.511 Methylurea Compounds D008782 +
    D02.948.594 Nitrosourea Compounds D009607 +
    D02.948.684 Phenylurea Compounds D010671 +
    D02.948.828 Sulfonylurea Compounds D013453 +
    D02.948.898 Thiourea D013890 +