... Page 6. HELVETICA CHIMICA ACTA - VOl. 77 (1994) ... The results are compiled in Table 1. The 3J(NH,HC(cr))'s of 5 and 6 (major form of C, symmetry) are in good agreement with extended peptide chains with 4 = 1 50", as it is expected for a /I-sheet [l 11. ...