... a nd studied the conformation of cyclo17, 21- [Asp17,Lys 21] hCt (16 –22)-NH2( 1a) , cyclo17, 21- [Asp17,D-Phe19,Lys 21] hCt (16 –22)-NH2( 2a) , cyclo17, 21- [Asp17,Aib19, Lys 21] hCt (16 –22)-NH2( 3a) , and ... tudies, the receptor binding a nities, and the hypocalcemic potencies in vivo of hCt, sCt, analogues 1 6and/or the partial sequence analogues 1a, 1b, 2a, and 3a. The CD data of the partial sequence ... [Asp17,Lys 21] hCt (16 –22)-NH2(1b) that comprise mainly the lactambridge-containing region 16 –2 2 of analogues 1, 2 and 3,respectively, and als o a linear control peptide for 1a ,analogue 1b.Conformational...