levonorgestrel cyclopropylcarboxylate 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. it was developed by the world health organization's special programme on human reproduction in the 1980s. analogues of levonorgestrel cyclopropylcarboxylate include levonorgestrel cyclobutylcarboxylate (hrp-001) and levonorgestrel butanoate (hrp-002). levonorgestrel cyclopropylcarboxylateclinical dataother nameshrp-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 cyclopropanecarboxylateroutes ofadministrationintramuscular injectiondrug classprogestogen; progestin; progestogen esteridentifiers iupac name phenanthren-17-yl] cyclopropanecarboxylate cas number86679-35-8pubchem cid10317658chemspider8493122chemical and physical dataformulac25h32o3molar mass380.528 g·mol−13d model (jsmol)interactive image smiles cc12cc3(1cc2(c#c)oc(=o)c4cc4)ccc5=cc(=o)cc35 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/s1key:tzzxnsuftuxhre-ayedezqksa-n