(2S,5S,8S,11S)-1-ACETYL-1,4-DIAZA-3-KETO-5-CARBOXY-10-THIA-TRICYCLO-[2.8.0(4,8)]-TRIDECANE, 1 THE PREFERRED CONFORMATION OF 1 (1 = ALPHA-TEMP-OH) AND ITS PEPTIDE CONJUGATES ALPHA-TEMP-L-(ALA)N-OR (N=1 TO 4) AND ALPHA-TEMP-L-ALA-L-PHE-L-LYS(EPSILON-BOC)-L-LYS(EPSILON-BOC)-NHME STUDIES OF TEMPLATES FOR ALPHA-HELIX FORMATIO