Maleic hydrazide

Maleic hydrazide

File:Maleic hydrazide.svg
File:Maleic hydrazide molecule spacefill.png
Names
IUPAC name 1,2-dihydropyridazine-3,6-dione
Identifiers
CAS Number	123-33-1
3D model (JSmol)	Interactive image
ChEBI	CHEBI:81771
ChEMBL	ChEMBL1489913
ChemSpider	20632
ECHA InfoCard
EC Number	204-619-9
E number
KEGG	C18474
PubChem CID	21954
RTECS number	UR5950000
UNII	TQ7L3FCV66
UN number	3082 3077
CompTox Dashboard (EPA)	{{#property:P3117}}
InChI InChI=1S/C4H4N2O2/c7-3-1-2-4(8)6-5-3/h1-2H,(H,5,7)(H,6,8) Key: BGRDGMRNKXEXQD-UHFFFAOYSA-N
SMILES C1=CC(=O)NNC1=O
Properties
Chemical formula	C4H4N2O2
Molar mass	112.088 g·mol−1
Density	1.6 g/cm3
Melting point	296–298 °C (decomposes)
Hazards
GHS labelling:
Pictograms	GHS07: Exclamation markGHS08: Health hazard
Signal word	Warning
Hazard statements	H315, H319, H335, H341
Precautionary statements	P201, P202, P261, P264, P271, P280, P281, P302+P352, P304+P340, P305+P351+P338, P308+P313, P312, P321, P332+P313, P337+P313, P362, P403+P233, P405, P501
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Maleic hydrazide, often known by the brand name Fazor, is a plant growth regulator that reduces growth through preventing cell division but not cell enlargement. It is applied to the foliage of potato, onion, garlic and carrot crops to prevent sprouting during storage. It can also be used to control volunteer potatoes that are left in the field during harvesting. It was first identified in the 1940s but was not used commercially in the United Kingdom until 1984. The banning of chlorpropham as a sprout suppressant in 2019 has led renewed interest in how maleic hydrazide can be used in potatoes.