Carbazide
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In chemistry, a carbazide is a functional group with the general formula RNH−NH(C=O)NH−NHR. They can be derived from the condensation of carbonic acid with a hydrazine. Carbohydrazide is the simplest carbazide, with another common carbazide being diphenylcarbazide, which is used as an analytical reagent.
Thiocarbazide
The sulfur analog is called a thiocarbazide, of which thiocarbohydrazide is the simplest example.
Carbazone and thiocarbazone
A carbazone is a partially oxidized carbazide with the general formula R=NNH(C=O)NH−NHR. The sulfur analog is called a thiocarbazone, of which dithizone is an example.