All
 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 +