Levonorgestrel cyclobutylcarboxylate

Levonorgestrel cyclobutylcarboxylate
Clinical data
Other names	HRP-001; HRP001; Levonorgestrel cyclobutyl-carboxylate; Levonorgestrel cyclobutanecarboxylate; Levonorgestrel 17β-cyclobutylcarboxylate; 17α-Ethynyl-18-methyl-19-nortestosterone 17β-cyclobutylcarboxylate; 17α-Ethynyl-18-methylestr-4-en-17β-ol-3-one 17β-cyclobutylcarboxylate; 13-Ethyl-17α-hydroxy-18,19-dinorpregn-4-en-20-yn-3-one cyclobutanecarboxylate
Routes of; administration	Intramuscular injection
Drug class	Progestogen; Progestin; Progestogen ester
Identifiers
	IUPAC name [(8R,9S,10R,13S,14S,17R)-13-Ethyl-17-ethynyl-3-oxo-1,2,6,7,8,9,10,11,12,14,15,16-dodecahydrocyclopenta[a]phenanthren-17-yl] cyclobutanecarboxylate;
CAS Number	86679-36-9;
PubChem CID	10092040;
ChemSpider	21165289;
CompTox Dashboard (EPA)	DTXSID00235759 ;
ECHA InfoCard	100.081.126
Chemical and physical data
Formula	C26H34O3
Molar mass	394.555 g·mol−1
3D model (JSmol)	Interactive image;
	SMILES CC[C@]12CC[C@H]3[C@H]([C@@H]1CC[C@]2(C#C)OC(=O)C4CCC4)CCC5=CC(=O)CC[C@H]35;
	InChI InChI=1S/C26H34O3/c1-3-25-14-12-21-20-11-9-19(27)16-18(20)8-10-22(21)23(25)13-15-26(25,4-2)29-24(28)17-6-5-7-17/h2,16-17,20-23H,3,5-15H2,1H3/t20-,21+,22+,23-,25-,26-/m0/s1; Key:WWGTWFPUIPEHNX-UKNJCJGYSA-N;

Levonorgestrel cyclobutylcarboxylate (or levonorgestrel 17β-cyclobutylcarboxylate; developmental code name HRP-001) is a progestin and a progestogen ester which was studied for potential use as an injectable hormonal contraceptive but was never marketed. It was developed by the World Health Organization's Special Programme on Human Reproduction in the 1980s. Analogues of levonorgestrel cyclobutylcarboxylate include levonorgestrel butanoate (HRP-002) and levonorgestrel cyclopropylcarboxylate (HRP-003).