An X‐ray study of poly(L‐prolyl‐L‐α‐phenylglycyl‐L‐proline)

X‐ray diffraction studies have been made on the polytripeptide poly(L‐prolyl‐L‐α‐phenylglycyl‐L‐proline). Its structure has been found to be helical, with a poly(L‐proline) II conformation, packed in an orthorhombic lattice, space group P21212, with a = 14.3 Å, b = 13.5 Å, and c = 9.4 Å.