Calonyctin A-2d is one of two components of the plant growth regulator known as calonyctin. It's a glycoside, meaning it's a molecule made up of a sugar (specifically, a tetrasaccharide) and a non-sugar component called an aglycone. The aglycone in calonyctin A-2d is composed of two hydroxy fatty acid residues. It's a macrocyclic structure, meaning it has a large ring.
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Calonyctin is a mixture of homologous glycolipids consisting of a common deoxygenated tetrasaccharide residue and 11-hydroxy fatty acids, which are named calonyctin A1 (1) and A2 (2), respectively (Fig. 1).
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