Abscisic acid

Abscisic acid
Names
	Preferred IUPAC name (2Z,4E)-5-[(1S)-1-Hydroxy-2,6,6-trimethyl-4-oxocyclohex-2-en-1-yl]-3-methylpenta-2,4-dienoic acid
	Other names (2Z,4E)-(S)-5-(1-Hydroxy-2,6,6-trimethyl-4-oxo-2-cyclohexen-1-yl)-3-methyl-2,4-pentanedienoic acid; Dormic acid; Dormin
Identifiers
CAS Number	21293-29-8 ;
3D model (JSmol)	Interactive image;
Abbreviations	ABA
Beilstein Reference	2698956
ChEBI	CHEBI:2365 ;
ChEMBL	ChEMBL288040 ;
ChemSpider	4444418 ;
ECHA InfoCard	100.040.275
EC Number	244-319-5;
MeSH	Abscisic+Acid
PubChem CID	5280896;
RTECS number	RZ2475100;
UNII	72S9A8J5GW ;
CompTox Dashboard (EPA)	DTXSID0036766 ;
	InChI InChI=1S/C15H20O4/c1-10(7-13(17)18)5-6-15(19)11(2)8-12(16)9-14(15,3)4/h5-8,19H,9H2,1-4H3,(H,17,18)/b6-5+,10-7-/t15-/m1/s1 Key: JLIDBLDQVAYHNE-YKALOCIXSA-N ;
	SMILES OC(=O)\C=C(\C)/C=C/[C@@]1(O)C(C)=CC(=O)CC1(C)C;
Properties
Chemical formula	C15H20O4
Molar mass	264.321 g·mol−1
Appearance	Colorless crystals
Density	1.193 g/mL
Melting point	163 °C (325 °F; 436 K)
log P	1.896
Acidity (pKa)	4.868
Basicity (pKb)	9.129
Hazards
	GHS labelling:
Pictograms
Signal word	Warning
Hazard statements	H315, H319, H335
Precautionary statements	P261, P264, P271, P280, P302+P352, P304+P340, P305+P351+P338, 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). verify (what is ?) Infobox references

Abscisic acid (ABA or abscisin II) is a plant hormone. ABA functions in many plant developmental processes, including seed and bud dormancy, the control of organ size and stomatal closure. It is especially important for plants in the response to environmental stresses, including drought, soil salinity, cold tolerance, freezing tolerance, heat stress and heavy metal ion tolerance.