Title: Azelnidipine
CAS Registry Number: 123524-52-7
CAS Name: 2-Amino-1,4-dihydro-6-methyl-4-(3-nitrophenyl)-3,5-pyridinedicarboxylic acid 3-[1-(diphenylmethyl)-3-azetidinyl] 5-(1-methylethyl) ester
Additional Names: (±)-3-(1-diphenylmethylazetidin-3-yl) 5-isopropyl 2-amino-1,4-dihydro-6-methyl-4-(3-nitrophenyl)-3,5-pyridinedicarboxylate
Manufacturers' Codes: CS-905; RS-9054
Trademarks: Calblock (Sankyo)
Molecular Formula: C33H34N4O6
Molecular Weight: 582.65
Percent Composition: C 68.03%, H 5.88%, N 9.62%, O 16.48%
Literature References: Dihydropyridine L-type calcium channel blocker. Prepn: H. Koike et al., EP 266922; eidem, US 4772596 (both 1988 to Sankyo); T. Kobayashi et al., Chem. Pharm. Bull. 43, 797 (1995). Clinical evaluation in hypertension: M. Arita et al., J. Cardiovasc. Pharmacol. 33, 186 (1999). Review of pharmacology: Y. Yagil, A. Lustig, Cardiovasc. Drug Rev. 13, 137-148 (1995); of development, pharmacokinetics, safety, and clinical experience: H. Koike et al., Annu. Rep. Sankyo Res. Lab. 54, 1-64 (2002); of pharmacology and clinical experience: K. Wellington, L. J. Scott, Drugs 63, 2613-2621 (2003).
Properties: Pale yellow to yellow crystalline powder, mp 122-123°. Insol in water. pKa 7.89. LD50 in female, male mice, female, male rats (mg/kg): 785, 979, 1267, 1971 orally (Koike).
Melting point: mp 122-123°
pKa: pKa 7.89
Toxicity data: LD50 in female, male mice, female, male rats (mg/kg): 785, 979, 1267, 1971 orally
Therap-Cat: Antihypertensive.
Keywords: Antihypertensive; Dihydropyridine Derivatives.
Azidamfenicol Azidocillin Azimsulfuron Azinphos-methyl Azintamide

Systematic (IUPAC) name
O3-[1-[di(phenyl)methyl]azetidin-3-yl] O5-propan-2-yl 2-amino-6-methyl-4-(3-nitrophenyl)-1,4-dihydropyridine-3,5-dicarboxylate
Clinical data
AHFS/ International Drug Names
Legal status Prescription only
Routes Oral
CAS number 123524-52-7 N
ATC code None
PubChem CID 65948
ChemSpider 59352 YesY
KEGG D01145 YesY
Chemical data
Formula C33H34N4O6 
Mol. mass 582.64 g/mol
 N (what is this?)  (verify)

Azelnidipine (INN; marketed under the brand name Calblock) is a dihydropyridine calcium channel blocker. It is sold in Japan by Daiichi-Sankyo pharmaceuticals, Inc. Unlike nicardipine, it has a gradual onset and has a long-lasting hypotensive effect, with little increase in heart rate.[1]