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2D Structure
Also known as: 480-85-3, Senecifolinene, Retronecin, (+)-retronecine, Ccris 5776, (1r,7ar)-7-(hydroxymethyl)-2,3,5,7a-tetrahydro-1h-pyrrolizin-1-ol
Molecular Formula
C8H13NO2
Molecular Weight
155.19  g/mol
InChI Key
HJSJELVDQOXCHO-HTQZYQBOSA-N
FDA UNII
2P5723M6II

retronecine is a natural product found in Senecio nebrodensis, Senecio squalidus, and other organisms with data available.
1 2D Structure

2D Structure

2 Identification
2.1 Computed Descriptors
2.1.1 IUPAC Name
(1R,8R)-7-(hydroxymethyl)-2,3,5,8-tetrahydro-1H-pyrrolizin-1-ol
2.1.2 InChI
InChI=1S/C8H13NO2/c10-5-6-1-3-9-4-2-7(11)8(6)9/h1,7-8,10-11H,2-5H2/t7-,8-/m1/s1
2.1.3 InChI Key
HJSJELVDQOXCHO-HTQZYQBOSA-N
2.1.4 Canonical SMILES
C1CN2CC=C(C2C1O)CO
2.1.5 Isomeric SMILES
C1CN2CC=C([C@@H]2[C@@H]1O)CO
2.2 Other Identifiers
2.2.1 UNII
2P5723M6II
2.3 Synonyms
2.3.1 MeSH Synonyms

1. Heliotridine

2. Retronecine, (1s-cis)-isomer

3. Retronecine, Monohydrochloride, (1s-cis)-isomer

4. Retronecine, Monohydrochloride, (1s-trans)-isomer

2.3.2 Depositor-Supplied Synonyms

1. 480-85-3

2. Senecifolinene

3. Retronecin

4. (+)-retronecine

5. Ccris 5776

6. (1r,7ar)-7-(hydroxymethyl)-2,3,5,7a-tetrahydro-1h-pyrrolizin-1-ol

7. (1r,8r)-7-(hydroxymethyl)-2,3,5,8-tetrahydro-1h-pyrrolizin-1-ol

8. 2p5723m6ii

9. (1r,7ar)-2,3,5,7a-tetrahydro-1-hydroxy-1h-pyrrolizine-7-methanol

10. ( )-retronecine

11. Hsdb 3567

12. Unii-2p5723m6ii

13. Retronecine [mi]

14. 1h-pyrrolizine-7-methanol, 2,3,5,7a-beta-tetrahydro-1-alpha-hydroxy-

15. Retronecine [hsdb]

16. Schembl673883

17. Chebi:8821

18. Retronecine, Analytical Standard

19. Dtxsid401020156

20. Hy-n8419

21. Zinc1996064

22. Mfcd01684783

23. Stl564628

24. 1h-pyrrolizine-7-methanol, 2,3,5,7a-tetrahydro-1-hydroxy-, (1r-trans)-

25. Akos003672869

26. Cs-0144131

27. C06177

28. Q3933789

2.4 Create Date
2005-06-24
3 Chemical and Physical Properties
Molecular Weight 155.19 g/mol
Molecular Formula C8H13NO2
XLogP3-1.3
Hydrogen Bond Donor Count2
Hydrogen Bond Acceptor Count3
Rotatable Bond Count1
Exact Mass155.094628657 g/mol
Monoisotopic Mass155.094628657 g/mol
Topological Polar Surface Area43.7 Ų
Heavy Atom Count11
Formal Charge0
Complexity191
Isotope Atom Count0
Defined Atom Stereocenter Count2
Undefined Atom Stereocenter Count0
Defined Bond Stereocenter Count0
Undefined Bond Stereocenter Count0
Covalently Bonded Unit Count1
4 Pharmacology and Biochemistry
4.1 Absorption, Distribution and Excretion

Lactating rats dosed with (3)H-retronecine excreted within 3 hr approx 0.08% of the applied radioactivity in the milk mainly as yet not identified water soluble retronecine-derived metabolites and approx 0.02% as unchanged pyrrolizidine alkaloids (pas). Highest tissue levels of pas and metabolites, 6 hr after admin were found in liver and lungs.

PMID:6623523 Luthy J et al; Toxicol Lett 17(3-4): 283 (1983)


4.2 Metabolism/Metabolites

Steric hindrance around the ester groups was the major factor inhibiting hydrolysis of pyrrolizidine alkaloids. Enzymic hydrolysis of retronecine di-isovalerate occurred primarily at the allylic 9-ester group. The results supported the view that a factor contributing to the lower hepatotoxicity of semisynthetic retronecine diesters compared with some natural pyrrolizidine alkaloids, is their greater susceptibility to detoxication by hydrolysis.

Mattocks A; Toxicol Lett 14(1-2) 111 (1982)


Levels of pyrrolic metabolites were measured in the livers of rats given some pyrrolizidine alkaloids and semisynthetic derivatives. Structural and chemical features favoring the formation of such metabolites were defined. The most important of these were steric hindrance or chemical properties giving resistance to ester hydrolysis; lipophilic character, allowing access to hepatic microsomal enzymes; a conformation favoring microsomal oxidation of the pyrroline ring in preference to n-oxidation.

PMID:7226276 Mattocks A; Chem-Biol Interact 35(3): 301 (1981)


Levels of pyrrolic metabolites were measured in the livers of rats given some pyrrolizidine alkaloids and semisynthetic derivatives. ... Heliotridine-based alkaloids gave more pyrrole than similar retronecine esters, heliotridine ditiglate gave less pyrrole than retronecine ditiglate because the former was more open to hydrolytic attack.

PMID:7226276 Mattocks AR; Chem-Biol Interact 35(3): 301-310 (1981)