Molecule structure of (R)-Fexofenadine (CAS NO.139965-10-9):

Molecular Formula: C₃₂H₃₉NO₄
Molecular Weight: 501.66 g/mol
CAS Registry Number: 139965-10-9 
Index of Refraction: 1.596
Molar Refractivity: 145.86 cm³
Molar Volume: 428.1 cm³
Polarizability: 57.82×10^-24 cm³
Surface Tension: 52.4 dyne/cm
Density: 1.171 g/cm³ 
Melting Point: 141-143 °C
Flash Point: 375.5 °C
Enthalpy of Vaporization: 107.22 kJ/mol
Boiling Point: 697.3 °C at 760 mmHg
Vapour Pressure: 2.08E-20 mmHg at 25 °C 
InChI: InChI=1/C32H39NO4/c1-31(2,30(35)36)25-17-15-24(16-18-25)29(34)14-9-21-33-22-19-28(20-23-33)32(37,26-10-5-3-6-11-26)27-12-7-4-8-13-27/h3-8,10-13,15-18,28-29,34,37H,9,14,19-23H2,1-2H3,(H,35,36) 
InChIKey: RWTNPBWLLIMQHL-UHFFFAOYAM
Std. InChI: InChI=1S/C32H39NO4/c1-31(2,30(35)36)25-17-15-24(16-18-25)29(34)14-9-21-33-22-19-28(20-23-33)32(37,26-10-5-3-6-11-26)27-12-7-4-8-13-27/h3-8,10-13,15-18,28-29,34,37H,9,14,19-23H2,1-2H3,(H,35,36) 
Std. InChIKey: RWTNPBWLLIMQHL-UHFFFAOYSA-N 
Product Categories: Chiral Reagents; Intermediates & Fine Chemicals; Metabolites; Pharmaceuticals

 (R)-Fexofenadine (CAS NO.139965-10-9) is used as a metabolite of of terfenadine and a H1-Histamine receptor antagonist.

 (R)-Fexofenadine (CAS NO.139965-10-9) is also named as Terfenadine carboxylate ; (±)-2-[4-(1-Hydroxy-4-{4-[hydroxy(diphenyl)methyl]-1-piperidinyl}butyl)phenyl]-2-methylpropanoic Acid Hydrochloride ; 2-(4-(1-Hydroxy-4-(4-(hydroxydiphenylmethyl)-1-piperidinyl)butyl)phenyl)-2-methylpropionic acid ; 2-[4-(1-Hydroxy-4-{4-[hydroxy(diphenyl)methyl]piperidin-1-yl}butyl)phenyl]-2-methylpropanoic acid ; 4-(1-hydroxy-4-(4-(hydroxydiphenylmethyl)-1-piperidinyl)butyl)-alpha,alpha-dimethylbenzeneacetic acid ; Bbenzeneacetic acid, 4-[1-hydroxy-4-[4-(hydroxydiphenylmethyl)-1-piperidinyl]butyl]-a,a-dimethyl- . (R)-Fexofenadine (CAS NO.139965-10-9) is white powder.