Levonorgestrel cyclopropylcarboxylate

Levonorgestrel cyclopropylcarboxylate (developmental code name HRP-003), or levonorgestrel 17β-cyclopropylcarboxylate, is a progestin and a progestogen ester which was studied for potential use as an injectable hormonal contraceptive but was never marketed.^{[1][2][3][4][5][6][7][8][9][10]} It was developed by the World Health Organization's Special Programme on Human Reproduction in the 1980s.^[1][2][9] Analogues of levonorgestrel cyclopropylcarboxylate include levonorgestrel cyclobutylcarboxylate (HRP-001) and levonorgestrel butanoate (HRP-002).^[1][2][3]

Levonorgestrel cyclopropylcarboxylate

Clinical data
Other names	HRP-003; HRP003; Levonorgestrel cyclopropyl-carboxylate; Levonorgestrel 17β-cyclopropylcarboxylate; 17α-Ethynyl-18-methyl-19-nortestosterone 17β-cyclopropylcarboxylate; 17α-Ethynyl-18-methylestr-4-en-17β-ol-3-one 17β-cyclopropylcarboxylate; 13-Ethyl-17α-hydroxy-18,19-dinorpregn-4-en-20-yn-3-one cyclopropanecarboxylate
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] cyclopropanecarboxylate
CAS Number	86679-35-8
PubChem CID	10317658
ChemSpider	8493122
Chemical and physical data
Formula	C25H32O3
Molar mass	380.528 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)C4CC4)CCC5=CC(=O)CC[C@H]35
InChI InChI=1S/C25H32O3/c1-3-24-13-11-20-19-10-8-18(26)15-17(19)7-9-21(20)22(24)12-14-25(24,4-2)28-23(27)16-5-6-16/h2,15-16,19-22H,3,5-14H2,1H3/t19-,20+,21+,22-,24-,25-/m0/s1 Key:TZZXNSUFTUXHRE-AYEDEZQKSA-N

See also

• List of progestogen esters § Esters of 19-nortestosterone derivatives
• Progestogen-only injectable contraceptive