Beta-amyrin

Amyrins

α-Amyrin
β-Amyrin
Names
IUPAC names α: (3β)-Urs-12-en-3-ol β: (3β)-Olean-12-en-3-ol δ: (3β)-Olean-13(18)-en-3-ol
Other names α: α-Amyrenol; α-Amirin; α-Amyrine; Urs-12-en-3β-ol; Viminalol β: β-Amyrenol; β-Amirin; β-Amyrine; Olean-12-en-3β-ol; 3β-Hydroxyolean-12-ene
Identifiers
CAS Number	638-95-9 (α) Y 559-70-6 (β) Y 508-04-3 (δ) Y
3D model (Jmol)	(α): Interactive image (β): Interactive image
ChemSpider	65935 (α) 65921 (β) 26333109 (δ)
ECHA InfoCard	100.010.321
PubChem CID	73170 (α) 73145 (β) 12358447 (δ)
InChI InChI=1S/C30H50O/c1-19-11-14-27(5)17-18-29(7)21(25(27)20(19)2)9-10-23-28(6)15-13-24(31)26(3,4)22(28)12-16-30(23,29)8/h9,19-20,22-25,31H,10-18H2,1-8H3/t19-,20+,22+,23-,24+,25+,27-,28+,29-,30-/m1/s1 Key: FSLPMRQHCOLESF-SFMCKYFRSA-N (β): InChI=1S/C30H50O/c1-25(2)15-16-27(5)17-18-29(7)20(21(27)19-25)9-10-23-28(6)13-12-24(31)26(3,4)22(28)11-14-30(23,29)8/h9,21-24,31H,10-19H2,1-8H3/t21-,22-,23+,24-,27+,28-,29+,30+/m0/s1 Key: JFSHUTJDVKUMTJ-QHPUVITPSA-N
SMILES (α): O[C@H]2CC[C@@]1([C@@H]3[C@](CC[C@H]1C2(C)C)(C)[C@]5(C(=C/C3)\[C@@H]4[C@@H](C)[C@H](C)CC[C@]4(C)CC5)C)C (β): C[C@@]12CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)O)C)C)[C@@H]1CC(CC2)(C)C)C
Properties
Chemical formula	C30H50O
Molar mass	426.73 g·mol−1
Melting point	α: 186 °C β: 197-187.5 °C
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

The amyrins are three closely related natural chemical compounds of the triterpene class. They are designated α-amyrin (ursane skeleton), β-amyrin (oleanane skeleton) and δ-amyrin. Each is a pentacyclic triterpenol with the chemical formula C₃₀H₅₀O. They are widely distributed in nature and have been isolated from a variety of plant sources such as epicuticular wax. In plant biosynthesis, α-amyrin is the precursor of ursolic acid and β-amyrin is the precursor of oleanolic acid. All three amyrins occur in the surface wax of tomato fruit. α-Amyrin is found in dandelion coffee.